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Operator’s Manual

Coherent Magnum II Laser

Operator’s ManualCoherent Magnum II Laser

27650 SW 95th Ave.Wilsonville, OR 97070

Coherent Magnum II Laser Operator’s Manual

This document is copyrighted with all rights reserved. Under the copyrightlaws, this document may not be copied in whole or in part or reproduced inany other media without the express written permission of Coherent, Inc.Permitted copies must carry the same proprietary and copyright notices aswere affixed to the original. This exception does not allow copies to bemade for others, whether or not sold, but all the material purchased maybe sold, given, or loaned to another person. Under the law, copyingincludes translation into another language.

Coherent and the Coherent Logo are trademarks or registered trademarksof Coherent, Inc. All other trademarks or registered trademarks are theproperty of their respective owners.

Patents referenced in this document were active as of the printing date ofthe manual (see last page for date). The patents referenced herein mayhave expired. You are advised to check to see if the patents are still active:http://portal.uspto.gov/external/portal/pair.

Every effort has been made to ensure that the data given in this documentis accurate. The information, figures, tables, specifications and schematicscontained herein are subject to change without notice. Coherent makes nowarranty or representation, either expressed or implied with respect to thisdocument. In no event will Coherent be liable for any direct, indirect,special, incidental or consequential damages resulting from any defects inits documentation.

Technical SupportIn the US:

Should you experience any difficulties with your laser or need anytechnical information, please visit our website: www.Coherent.com.Additional support can be obtained by contacting our Technical SupportHotline at 1.800.367.7890 (1.408.764.4557 outside the U.S.), or [email protected]. Telephone coverage is available aroundthe clock (except U.S. holidays and company shutdowns).

If you call outside our office hours, your call will be taken by our answeringsystem and will be returned when the office reopens.

If there are technical difficulties with your laser that cannot be resolved bysupport mechanisms outlined above, e-mail, or telephone CoherentTechnical Support with a description of the problem and the correctivesteps attempted. When communicating with our Technical SupportDepartment via the web or telephone, the Support Engineer responding toyour request will require the model and Laser Head serial number of yourlaser system.

Outside the US:

If you are located outside the U.S., visit our website for technicalassistance or contact our local service representative. Representativephone numbers and addresses can be found on the Coherent website:www.Coherent.com.

Coherent provides telephone and web technical assistance as a service toits customers and assumes no liability thereby for any injury or damagethat may occur contemporaneous with such services. These supportservices do not affect, under any circumstances, the terms of any warrantyagreement between Coherent and the buyer. Operation of any Coherentlaser with any of its interlocks defeated is always at the operator's own risk

ii

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mailto:[email protected]

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Table of Contents

TABLE OF CONTENTS

Signal Words and Symbols in this Manual.............................................................................vSignal Words..................................................................................................................vSymbols ....................................................................................................................... vi

Preface ................................................................................................................................. viiU.S. Export Control Laws Compliance ............................................................................... viiIncoming Inspection ........................................................................................................... viii

Section One: Laser Safety .......................................................................................... 1-1Classification ...................................................................................................................... 1-2CDRH Classification .......................................................................................................... 1-3IEC Classification ............................................................................................................... 1-4

Classification Requirements ...................................................................................... 1-5Protecting Devices .............................................................................................................. 1-6

Section Two: User Interface...................................................................................... 2-1Laser Beam Panel ............................................................................................................... 2-1

Laser Beam Output .................................................................................................... 2-2Shutter ........................................................................................................................ 2-2Green LED................................................................................................................. 2-2

Control Panel ...................................................................................................................... 2-3DC Power Supply Connector..................................................................................... 2-3Power Switch ............................................................................................................. 2-4Green Power LED...................................................................................................... 2-4Remote Safety Interlock Connector........................................................................... 2-4Keylock Switch.......................................................................................................... 2-4Protection Indicator (Red LED)................................................................................. 2-4Maintenance or Laser Diode Life Indicator (Yellow LED)....................................... 2-5Time Lapse Counter (Timer) LCD ............................................................................ 2-5Modulation and Monitoring Connector (DB-9)......................................................... 2-5

Separate Driver (SD) Option: Additional Panels................................................................ 2-7

Section Three: Laser Operation ............................................................................. 3-1Installation .......................................................................................................................... 3-2Power Supply Requirements............................................................................................... 3-3

Operating Modes........................................................................................................ 3-3Turning ON the Unit........................................................................................................... 3-5

CW Operating Mode.................................................................................................. 3-5Modulation Mode ...................................................................................................... 3-6

Maximum Output Power Adjustment................................................................................. 3-6Operating Environment....................................................................................................... 3-7Servicing the Magnum II Laser .......................................................................................... 3-7Optics and Focusing............................................................................................................ 3-8Cleaning the Optics............................................................................................................. 3-9

iii


Section Four: Product Repair.................................................................................. 4-1Product Shipping Instructions............................................................................................. 4-1

Appendix A: Warranty ................................................................................................ 5-1

Glossary ................................................................................................................................. 6-1

LIST OF FIGURES

1-1. Laser (Side View) ............................................................................................................ 1-11-2. CDRH Class IIIb Warning/ID/Aperture Labels .............................................................. 1-31-3. CDRH Class IV Warning/ID/Aperture Labels ................................................................ 1-41-4. IEC Warning/ID/Aperture Labels.................................................................................... 1-4

2-1. Laser Beam Exit Aperture View (Standard and Separate Driver Options) ..................... 2-12-2. Control Panel ................................................................................................................... 2-32-3. DC Power Supply Connector........................................................................................... 2-32-4. DB-9 Connector ............................................................................................................... 2-52-5. Temperature Monitoring Voltage vs. Temperature ......................................................... 2-62-6. Separate Driver Option .................................................................................................... 2-7

3-1. Mounting Holes ............................................................................................................... 3-23-2. Modulation Graphs .......................................................................................................... 3-43-3. Adjusting the Focus ......................................................................................................... 3-8

LIST OF TABLES

1-1. CDRH and IEC Requirements ......................................................................................... 1-6

iv

Table of Contents

Signal Words and Symbols in this Manual

This documentation may contain sections in which particularhazards are defined or special attention is drawn to particular condi-tions. These sections are indicated with signal words in accordancewith ANSI Z-535.6 and safety symbols (pictorial hazard alerts) inaccordance with ANSI Z-535.3 and ISO 7010.

Signal Words Four signal words are used in this documentation: DANGER,WARNING, CAUTION and NOTICE.

The signal words DANGER, WARNING and CAUTION desig-nate the degree or level of hazard when there is the risk of injury:

DANGER!Indicates a hazardous situation that, if not avoided, will result indeath or serious injury. This signal word is to be limited to themost extreme situations.

WARNING!Indicates a hazardous situation that, if not avoided, could resultin death or serious injury.

CAUTION!Indicates a hazardous situation that, if not avoided, could resultin minor or moderate injury.

The signal word “NOTICE” is used when there is the risk of prop-erty damage:

NOTICE!Indicates information considered important, but not hazard-related.

Messages relating to hazards that could result in both personal injuryand property damage are considered safety messages and not prop-erty damage messages.

v


Symbols The signal words DANGER, WARNING, and CAUTION arealways emphasized with a safety symbol that indicates a specialhazard, regardless of the hazard level:

This symbol is intended to alert the operator to the presence ofimportant operating and maintenance instructions.

This symbol is intended to alert the operator to the danger ofexposure to hazardous visible and invisible laser radiation.

This symbol is intended to alert the operator to the presence ofdangerous voltages within the product enclosure that may be ofsufficient magnitude to constitute a risk of electric shock.

This symbol is intended to alert the operator to the danger ofElectro-Static Discharge (ESD) susceptibility.

This symbol is intended to alert the operator to the danger ofcrushing injury.

This symbol is intended to alert the operator to the danger of alifting hazard.

vi

Table of Contents

Preface This manual contains user information for the Coherent Magnum IIlaser. From the “eye safe” design of our built-in mechanical shutterand integrated focus adjustment, to the uniform line intensity distri-bution, your Coherent structured laser light generator has beendeveloped with the end-user in mind. The Magnum II laser featureshigh quality glass optics and a rugged housing to maximize thelaser’s reliability. To ensure longer lifetime, all diode lasers haveundergone a burn-in period and a final quality control check beforeshipment.

U.S. Export Control Laws Compliance

It is the policy of Coherent to comply strictly with U.S. exportcontrol laws.

Export and re-export of lasers manufactured by Coherent are subjectto U.S. Export Administration Regulations, which are administeredby the Commerce Department. In addition, shipments of certaincomponents are regulated by the State Department under theInternational Traffic in Arms Regulations.

The applicable restrictions vary depending on the specific productinvolved and its destination. In some cases, U.S. law requires thatU.S. Government approval be obtained prior to resale, export orre-export of certain articles. When there is uncertainty about theobligations imposed by U.S. law, clarification should be obtainedfrom Coherent or an appropriate U.S. Government agency.

vii


Incoming Inspection

Immediately upon receipt of your product, examine the packagingmaterial and contents for shipment damage. Report any suchinstance to your receiving department or shipping company.

The shipment should contain the following items:

• One (1) laser unit

• One (1) wired circular connector to power the laser

• Two (2) keys for activating the keylock switch

• One (1) interlock plug with shortened contacts for remotesafety operation

• One (1) wired DB-9 plug for modulation and monitoringsignals

Magnum II Laser

(Side Profile) (Back Panel)

Power Connector Keys Interlock Plug DB-9 Plug

viii

Laser Safety

SECTION ONE: LASER SAFETY

In this section:

• Classification (p. 1-2)

• CDRH classification (p. 1-3)

• IEC classification (p. 1-4)

• Protecting devices (p. 1-6)

DANGER!The laser light generated by this unit may be in the infraredregion of the electromagnetic spectrum and may not be visibleby the human eye. Always use extreme caution when using thelaser.

DANGER!The laser light emitted by this laser may be in the infrared or UVarea of the electromagnetic spectrum and may not be visible tothe human eye. Use extreme caution at all times when using thelaser.

DANGER!The output power of this laser device is high enough to causepermanent damage to the human eye. Wear appropriate lasersafety goggles at all times when the laser is operational.

Figure 1-1. Laser (Side View)

Base Plate

Exit Aperture

Shutter

1 - 1


Classification Lasers are classified based upon the output power and the wave-length of a laser beam in a particular setup according to the UnitedStates Center for Devices & Radiological Health (CDRH) document21 CFR 1040.10 and upon demand, to the International Electrotech-nical Commission (IEC) document 60825-1:edition 2, March 2007.The protocol for classification described herein is a general outlineof the procedures. In actual practice, the settings can differdepending on the laser. Call us for details.

The longitudinal profile of the laser beam is verified in the factoryusing a specialized instrument. The laser beam (either as a raw beamor as a modified beam) is aimed onto a 7 mm aperture located at theappropriate distance away from the laser. A photo detector is placedjust behind the aperture and sends its electrical signals tocomputer-monitored equipment that records the highest outputpower level of the laser beam. In the case of a line laser, the entireline is scanned to find the highest output power.

With conventional Gaussian line generators, it is generally the hotcentral spot that causes its safety rating to go up one class (forexample, from CDRH Class II to IIIa). Our patented optics producea line of uniform intensity that does not have a hot spot at the center.Therefore, a Coherent non-Gaussian laser line offers a safer level ofexposure, in addition to more light and uniform illumination trans-mitted towards the object.

Magnum II lasers are tested prior to shipping to determine whichclass they belong to, and to provide CDRH and IEC classification.To understand the conditions required to classify a Coherent laser,consult us, or CDRH regulation 21 CFR 1040.10 and IEC standard60825-1, 2nd edition, 2007-03. The safety labels are affixed on topof the laser, close to the aperture.

1 - 2

Laser Safety

CDRH Classification

Our Magnum II lasers can comply with CDRH classification and fallin different safety classes, depending on output power, wavelength,and fan angle. According to CDRH 21CFR1040.10 regulations, theycan be classified either as Class IIIB or as Class IV devices.

Class IIIb—“Danger”

• Visible laser light between 5.0 and 500 mW

• Invisible laser light less than 500 mW

High-power visible lasers and infrared (IR) lasers. Considereddangerous to the human retina if exposed. This includes lookingdirectly into a reflection from a specular (mirror-like) surface.Normally, Class IIIb lasers will not produce a hazardous diffusereflection. At higher levels of the class, these lasers can produce skinhazards. Compliance is given on lasers that have a keylock box andremote interlock (both also integrated in the Magnum II). It is impor-tant to follow laser safety rules and wear appropriate protectiveeyewear when working around these lasers.

Figure 1-2. CDRH Class IIIb Warning/ID/Aperture Labels

2765

0 S

W 9

5TH

AV

EN

UE

, WIL

SO

NV

ILLE

, OR

970

70

MA

DE

IN U

SA

S

/N:

2765

0 S

W 9

5TH

AV

EN

UE

, WIL

SO

NV

ILLE

, OR

970

70

MA

DE

IN U

SA

S

/N:

Power output and wavelength details are located here.

Statement indicating that laser light is emitted from the aperture.

Warning statement follows.

CDRH laser class is located here.

Statement confirming whether or not the laser product is CDRH compliant. These

items are printed on the bottom of all of our stickers.

1 - 3


Class IV—“Danger”

• Visible and invisible laser light more than 500 mW

These lasers or laser systems produce a hazard not only from director specular reflections, but may also produce hazardous diffusereflections. Such lasers might produce significant skin hazards aswell as fire hazards. It is important to follow laser safety rules andwear appropriate protective eyewear when working around theselasers. Coherent and the United States Department of the Food &Drug Administration (CDRH) have jointly developed several safetyfeatures for the proper use of our laser products.

IEC Classification

Our Magnum II lasers can comply with IEC classification (if it isrequired, make sure to mention it when ordering) and fall in differentsafety classes, depending on output power, wavelength, and fanangle. According to IEC 60825-1 regulations, they can be classifiedas Class 3B or Class 4.

Figure 1-3. CDRH Class IV Warning/ID/Aperture Labels

Trademark, date, company address, serial number, and electronic option code are printed on the right side of all of our labels.

Figure 1-4. IEC Warning/ID/Aperture Labels

LASER RADIATION AVOID EXPOSURE TO BEAM CLASS 3B LASER PRODUCT

IEC

608

25-1

(200

7)

INVISIBLE LASER RADIATION AVOID EXPOSURE TO BEAM CLASS 3B LASER PRODUCT

IEC

608

25-1

(200

7)

LASER RADIATION AVOID EYE OR SKIN

EXPOSURE TO DIRECT OR SCATTERED RADIATION CLASS 4 LASER PRODUCT

IEC

608

25-1

(200

7)

INVISIBLE LASER RADIATION AVOID EYE OR SKIN

EXPOSURE TO DIRECT OR SCATTERED RADIATION CLASS 4 LASER PRODUCT

IEC

608

25-1

(200

7)

1 - 4

Laser Safety

Class 3B

Considered dangerous to your retina if exposed, including exposurewhen looking directly into a reflection from a specular (mirror-like)surface. Normally, lasers from this class will not produce ahazardous diffuse reflection. At higher levels of this class, theselasers can be skin hazards. It is important to follow laser safety rulesand wear appropriate protective eyewear when working aroundthese lasers.

Class 4

Identified as the highest class of laser radiation according to IEC.Radiation within this class is very dangerous, and viewing of thediffuse reflection might be unsafe. The beams of class 4 lasers arecapable of setting fire to materials onto which they are projected. Itis important to follow laser safety rules and wear appropriate protec-tive eyewear when working around these lasers.

Classification Requirements

Compliance is obtained once the laser meets the criteria establishedby the CDRH or the IEC—refer to Table 1-1 (p. 1-6) for a list ofCDRH and IEC requirements. Although Coherent lasers come stan-dard with CDRH classification, some custom-made lasers may notinclude all the safety features required by the class; however, ourlasers are always classified into a safety class, that is, CDRH ClassIIIb or IV, and IEC Class 3B or 4, regardless of compliance qualifi-cation.

NOTICE!Lasers do not need to include all the necessary safety features,unless required by the end-user. If they do not include all therequired safety features, they can not be used as standaloneproducts but must be incorporated into a system. It is theresponsibility of the manufacturer of the system using an OEMproduct to make sure that its system includes all the requiredsafety features to comply with CDRH regulations. If required,make sure to mention it when ordering.

1 - 5


Protecting Devices

There are three protecting devices for your Magnum II laser:

1. Shutter—The protective mechanism at the front of the opticalhead can be used as a beam blocker if the laser is left ON—see“Incoming Inspection” (p. viii).

2. Keylock Switch (Manual Reset)

• If the key is removed or if it is in the OFF position (hori-zontal), no laser beam will be emitted from the device,but the TEC circuit will continue to maintain a constantdiode temperature.

• If the key is in the ON position (vertical), the interlockconnector is inserted or its contacts are shortened, andthe unit is ON, a laser beam will be emitted from thedevice for class 3B lasers.

• The key switch must be manually reset (turned OFF andON) to enable resumption of accessible class 4 laser radi-ation emission after interruption of emission caused bythe use of the remote interlock connector or an interrup-tion of longer that 5 seconds of main electrical power.

Table 1-1. CDRH and IEC Requirements

CDRH IEC

Class IIIb

1. Laser radiation emission indicator (LED turning onwhen the laser is powered)

2. Beam attenuator (a shutter)

3. Warning/ID/Aperture label affixed (sticker on thelaser with all the required information)

4. Instruction manual

5. Removable keylock-actuated master control,preventing lasing when removed

6. Remote interlock connector that prevents lasingwhen removed

7. Laser radiation emission indicator that turns on priorto lasing (LED that lights up 5 to 10 seconds beforethe laser lights up)

8. On/off switch

Class IV

1. All items mentioned for Class IIIb, above

2. Manual reset mechanism

Class 3B and 4

1. Laser radiation emission indicator (audible signal orLED turning on when the laser is powered)

2. Beam attenuator (a permanently attached shutter,beamstop, or switch)

3. Warning/ID/Aperture label affixed (sticker on thelaser with all the required information)

4. Instruction manual

5. Removable keylock-actuated master control,preventing lasing when removed

6. Remote interlock connector that prevents lasingabove Class 1M or 2M, when removed

7. Manual reset mechanism for class 4

1 - 6

Laser Safety

3. Remote Safety Interlock Connector—The interlockconnector is located on the back panel of the Magnum II. Theunit will not generate a beam until the contacts of the interlockconnector are shortened. This means that the interlockconnector can be used two ways:

• For General Use—Insert the interlock plug (suppliedwith the unit) into the interlock connector for normallaser operation. The beam will automatically shut off ifthe interlock plug is not in the interlock connector.

• For Interlock System—When the interlock circuit isopened, the laser beam will automatically shut off. Thisfeature can be used in a laboratory environment, whenthe contacts are connected to the pins of a door contactswitch. The laser will shut off when the door is opened.

1 - 7


1 - 8

User Interface

SECTION TWO: USER INTERFACE

In this section:

• Laser beam panel (p. 2-1)

• Control panel (p. 2-3)

• Separate driver (SD) option: additional panels (p. 2-7)

NOTICE!Any reference in this manual to the “on” and “off” positions ofthe Main Switch or Key Switch, refer to the corresponding I/Obutton in the “I” (on) and “O” (off) positions respectively.

The Magnum II high power laser line generator has two packageoptions:

• Standard – which contains the laser diode, the opticalassembly, and the laser driver in a single integrated unit

• Separate driver (SD option) – which contains the laser diodeand the optical assembly in one unit, and the laser driver withlaser cable in a separate unit

Laser Beam Panel

The laser beam aperture is located on the laser beam panel (shownin the figure below) of the Magnum II. This section is the front panelof the Magnum II standard option and the front panel of the laserhead unit of the separate driver option.

Figure 2-1. Laser Beam Exit Aperture View (Standard and Separate Driver Options)

X X X X X

Base Plate

Green LED

Shutter

Laser Beam Exit Aperture

Shutter Lever

2 - 1


Laser Beam Output

The Magnum II generates a beam via its exit aperture—refer toFigure 2-1 (p. 2-1).

Shutter The shutter should be kept closed when the laser is not in use—referto Figure 2-1 (p. 2-1). Before turning ON the power, the shuttershould be opened (shutter lever in the upper position, towards “I”).Likewise, the shutter should be closed (shutter lever in the lowerposition, towards “O”) after turning OFF the unit power.

WARNING!The shutter should only be used to shut the laser beam off inemergency situations and only for very short periods of time.The high power beam generated by the Magnum II can perma-nently damage the shutter if it is kept closed for more than a fewseconds.

Green LED • (Standard laser package) - When the green LED is ON, thisindicates that a laser beam is being generated via the exit aper-ture.

• (Optional separated driver laser package) - The green LEDlights up when the Magnum II is ON (12 VDC in the entry andpower switch ON).

2 - 2

User Interface

Control Panel Both Magnum II options have the same control panel (refer toFigure 2-2, below). It is located at the back panel of the Magnum IIstandard option and the back panel of the laser driver unit of theseparate driver option.

DC Power Supply Connector

The circular connector on the shielded power cable (two 20 AWGwires + shield) should be connected to the circular socket on thepanel, taking into consideration the polarity.

The shield must be connected to the ground (earth) of the powersupply.

In the absence of a strong EMI environment, the shield can beconnected to the minus (-) terminal of the power supply.

Figure 2-2. Control Panel

Counter (Hours)

Modulation & Monitoring

Power Adjustment

Max

Maintenance

Warning 12 VDC

Main Switch

Sa

fety Interlock

Timer LCD

Modulation and Monitoring DB-9

Power Supply Input 12V (± -0.5V)

Base Plate

Remote Safety Interlock

Key Lock Switch

Maintenance Yellow LED

Protection Red LED

Beam Power Adjustment

Potentiometer

Green LED (Power ON)

ON/OFF (I/O) Power Switch

Figure 2-3. DC Power Supply Connector

A B

C White A + Green B SHD Black C -

2 - 3


Power Switch Pressing the power switch towards the “I” position will turn ON theMagnum II.

Green Power LED The green LED lights up when the Magnum II is ON (12 VDC in theentry and power switch ON).

Remote Safety Interlock Connector

The Magnum II is provided with a plug that has two pins connectedtogether.

• If the remote safety function is not being used, do not removethe interlock plug (provided by Coherent).

• To use the remote safety interlock, connect the two pins of theplug to remote contacts (relay or mechanical contacts on adoor, for example).

NOTICE!Connecting either of these two pins to an external voltage orground level can easily damage the laser, even after discon-necting the wires.

• When the interlock plug wires are disconnected, the laser willstop lasing—the TEC circuit, however, will continue to main-tain a constant diode temperature and the red LED indicatorwill turn ON.

Keylock Switch If the key is removed or is in the OFF position (horizontal), the laserwill stop lasing—the TEC circuit, however, will continue to main-tain a constant diode temperature and the red LED indicator will turnON.

Protection Indicator (Red LED)

There are three ways you can activate the protection indicator (redLED):

1. The two wires of the remote safety interlock are not connectedtogether.

2. The key is removed or is in the OFF position.

3. The laser diode temperature is not within the accepted range(20 to 30°C for the standard Magnum II).

2 - 4

User Interface

Maintenance or Laser Diode Life Indicator (Yellow LED)

After turning ON the unit, the yellow LED will remain ON until thekeylock switch is turned ON and the diode temperature is stabilizedwithin the acceptable range.

A yellow LED that remains active after the diode is lasing indicatesthat the laser diode is weakening and can no longer reach its initialmaximum optical output power. You can continue using the unituntil the diode is near the end of its lifetime.

Time Lapse Counter (Timer) LCD

The LCD displays the Magnum II operating time (in hours) from thetime the laser was first activated. This counter records the total timeduring which the laser is ON (not the time during which it is lasing).

Modulation and Monitoring Connector (DB-9)

Magnum II users can use the DB-9 plug provided byCoherent—refer to “Incoming Inspection” (p. viii) and Figure 2-4,above—or use their own DB-9 plug. This connector is used for themodulation of the output optical power and also for monitoring themain parameters of the laser:

• Modulation input (MOD): The external modulation signal(0 to 5V) should be applied between “pin 9 – signal” and “pin1 – ground” (Figure 2-4, above).

• Laser current monitoring output (I-LD): The monitoringvoltage (0 to 5V) of laser diode current is available between“pin 7 = signal” and “pin 1 = ground” (Figure 2-4, above). Bydefault, the value in mV or Volts is approximately equal to1/10th of the diode current value in mA or amperes. However,even if the scaling factor is not accurate, the voltage is approx-imately proportional to the laser current.

Figure 2-4. DB-9 Connector

Black

Yellow

White

Green Violet Blue

GND T-LD = Diode Temperature Monitor T-BD = Board Temperature Monitor I-LD = Diode Current Monitor

I-PD = Power (PD) Monitor

MOD = Modulation Input

1

2 7

8

9

6

2 - 5


• Beam power monitoring output (I-PD): The monitoringvoltage (0 to 5V) of laser diode beam power is proportional tothe current on the internal photodiode (attached to the diode).It is available between “pin 8 = signal” and “pin 1 =ground”—refer to Figure 2-4 (p. 2-5). By default, the value inmV or volts is approximately equal to 1/10th of the laser outputpower value in mW or Watts. However, even if the scalingfactor is not accurate, the voltage is approximately propor-tional to the current of the monitoring photodiode.

• Laser diode temperature monitoring output (T-LD): The moni-toring voltage (1 to 1.5V) of laser diode temperature is avail-able between “pin 6 = signal” and “pin 1 = ground”—refer toFigure 2-4 (p. 2-5). The temperature monitoring voltagecomes from an NTC thermistor attached to the diode and it isnot proportional to the temperature in oC (Figure 2-5, below).The value is approximate because the thermistor ground is notexactly the same as the laser diode ground.

• Board temperature monitoring output (T-BD): The monitoringvoltage (0.5 to 2V) of temperature inside the Magnum II boxis available between “pin 2 = signal” and “pin 1 =ground”—refer to Figure 2-4 (p. 2-5). The temperature moni-toring voltage comes from an NTC thermistor placed on theabove electronic board, inside the laser box, and is not propor-tional to the temperature in oC (Figure 2-5, below). The valueis approximate because the thermistor ground is not exactly thesame as the laser diode ground.

Figure 2-5. Temperature Monitoring Voltage vs. Temperature

Temp (°C)

Vtem

p (V

olts

)

0 7065 60 55 50 45 40 35 30 25 20 15 10 5 0.4

2

1.8

1.6

1.4

1.2

1

0.8

0.6

2 - 6

User Interface

Separate Driver (SD) Option: Additional Panels

The separate driver option of the Magnum II has a laser head unit aswell as a laser driver unit. The laser driver includes a laser cable witha connector permanently attached to it for connecting up to two units(refer to Figure 2-6, below).

Figure 2-6. Separate Driver Option

Fan

Laser Head Back Panel Laser Driver Front Panel

Cable

Connector

Strain Relief

Connector

Base Plate Base Plate

2 - 7


2 - 8

Laser Operation

SECTION THREE: LASER OPERATION

In this section:

• Installation (p. 3-2)

• Power supply requirements (p. 3-3)

• Turning on the unit (p. 3-5)

• Maximum output power adjustment (p. 3-6)

• Operating environment (p. 3-7)

• Servicing the Magnum II laser (p. 3-7)

• Optics and focusing (p. 3-8)

• Cleaning the optics (p. 3-9)

DANGER!The laser light emitted by this laser may be in the Infrared areaof the electromagnetic spectrum. The laser light may not bevisible to the human eye. Use extreme caution at all times whenlaser is in use.

DANGER!The output power of these laser devices is high enough to causepermanent damage to the human eye. Wear appropriate lasersafety goggles at all times when the laser is operational.

DANGER!Hazardous radiation exposure will result if the shutter is openedwhile the laser is on.

3 - 1


Installation Mounting

The mounting holes of the Magnum II laser (Standard and SeparateDriver options) are conveniently located beneath the laser—refer toFigure 3-1, below, for proper installation information.

NOTICE!Ensure that the Magnum II support is made of electrically- andthermally-conductive materials.

NOTICE!It is mandatory that you connect the Magnum II SeparateDriver units before switching ON the power. It is also mandatorythat you switch OFF the Magnum II Separate Driver beforedisconnecting the units. Proceeding otherwise will permanentlydamage the laser diode. Such damage is not covered by ourwarranty.

Ventilation

• To ensure proper ventilation of the laser, the fan should not beobstructed.

• Operate the laser in an environment with normal ventilation.

Figure 3-1. Mounting Holes

Bottom View

Exit Aperture

Standard Option

Separate Driver Option (Laser Driver)

Separate Driver Option (Laser Head)

Mounting Holes

Mounting Holes Mounting Holes

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Laser Operation

Power Supply Requirements

Coherent can provide the required power supply; however, if thecustomer provides the power supply, ensure that the followingguidelines are followed:

• It is preferable to have the power cable shield connected to theearth of the main AC outlet, via the DC power supply.

• Ensure that the power supply is CE certified.

The laser is protected against over-voltage and a calibrated internalfuse is used to protect the Magnum II against over-current. It is,however, strongly recommended that you supply the unit with a12.0 ± 0.5 VDC source at 3A minimum for lasers < 2W and 5Aminimum for lasers = 2W.

NOTICE!The GND pin on the DB-9 connector (pin 1) and the 0V lead ofthe power supply cable (black wire) are connected togetherinside the laser. If the external wires connected to this pin andthis lead are also connected together outside the laser, the resultis ground loop. In this case, the monitoring and the modulationsignals are not used correctly.

Use one of the following methods to avoid this problem:

- Have only one GND wire coming from outside. This GND wireis connected to the 0V lead of the power supply (black wire). TheGND pin of the DB-9 connector (pin1) must remain uncon-nected.

- Be sure that the GND pin on the DB-9 and the 0V lead of thepower supply are not connected together outside the laser.

Operating Modes The Magnum II laser has several modes of operation:

• CW mode—In this mode, the laser beam power is constant. Itsvalue can be adjusted by the beam power adjustment potenti-ometer located on the control panel—see Figure 2-2 (p. 2-3).With direct modulation (standard option –S or option –T), themodulation input must be connected to GND or left uncon-nected to generate a continuous beam. The Magnum II withreverse modulation (options –RT or –RS) requires a + 5 VDCsignal at the modulation input to generate a continuous beam.

• Linear modulation—In this mode, the beam power dependsalmost linearly on the modulation voltage. The curves shown

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in Figure 3-2, below, briefly explain this modulation type.There are two types of linear modulation:

• Direct modulation—A 0 VDC voltage at the modula-tion input produces the maximum beam power. A+ 5 VDC voltage at the modulation input produces nooptical output power (0 mW). Any voltage between1.0 V and + 4.0 V applied at the modulation input willgenerate a beam with a power level inversely propor-tional to the voltage at the modulation input.

• Reverse modulation—A +5 VDC voltage at the modu-lation input produces the maximum beam power. A0 VDC voltage on the modulation input produces nooptical power (0 mW). Any voltage between + 1.0 V and+ 4.0 V applied at the modulation input will generate abeam with a power level directly proportional to thevoltage at the modulation input.

• TTL modulation—In this mode, the beam power is controlledby a TTL signal at the modulation input. The optical outputpower can be either 0 mW or the maximum. TTL modulationcan also be either direct or reverse. The curves shown in thefollowing figure explain this modulation type.

Figure 3-2. Modulation Graphs

0 1 2 3 4 5

0 1 2 3 4 5

Out

put P

ower

Reverse Linear

Modulation

Direct Linear

Modulation

Opt

ical

Pow

er

Vmod (V)

Vmod (V)

Factory Set Values

Transitional States

Standard Option -S Option -RS

Option -T Option -RT

Reverse TTL

Modulation

Direct TTL

Modulation

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Laser Operation

Turning ON the Unit

WARNING!Do not place any flammable objects directly in front of the free,non-extended beam (without the line generating optics). Thehigh-power beam can cause objects to ignite.

NOTICE!The shutter must be open in order to emit a laser beam ontoyour target.

NOTICE!The shutter can not stay open for more than a few minutes, if alaser beam is emitted.

Once the laser is properly connected to the power supply, followthese instructions to operate it:

• Insert the interlock plug (provided by Coherent or by thecustomer). The key must be in the keylock switch (in the OFFposition).

• Turn ON the power supply.

• Turn ON the power switch of the unit.

• The power LED (green) on the rear panel will light up.

• The protection LED (red) on the rear panel will light up.

• The maintenance LED (yellow) on the rear panel willlight up.

CW Operating Mode

Magnum II lasers with direct modulation can emit light if the modu-lation wire is left unconnected or if it is connected to the ground slot.

To emit light, Magnum II lasers with reverse modulation require+ 5 VDC voltage at the modulation input (pins 9 and 1 of the DB-9connector).

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• Turn ON the keylock switch (vertical position) and wait for afew seconds.

• The protection LED indicator (red) will turn OFF and the laserwill emit light.

• The red LED can stay ON and the laser can stay OFF for a fewseconds until the TEC stabilizes the diode temperature to theset point (25°C in standard lasers).

• The maintenance LED indicator (yellow) will turn OFF;however, if it stays ON (meaning that the laser diode has weak-ened and is nearing depletion), the laser will still work until thelaser diode is fully consumed.

• For standard laser packages, the green LED on the front panelwill light up if the unit emits a laser beam.

Modulation Mode Apply the modulation signal between pins 9 (signal) and 1 (GND)of the DB-9 connector on the control panel:

• For the linear modulation option, the signal can be eitheranalog or pulsed and can have any value within the 0 to 5Vrange.

• For the TTL modulation units, the signal must have TTL typevoltage levels (0 or 5V).

• For the direct modulation (standard), a 0V signal will producethe maximum output power, while a 5V signal will produce0 mW of laser output (no beam).

• For the reverse modulation (option), a 0V signal will produce0 mW of laser output (no beam), while a 5V signal willproduce the maximum output power.

Maximum Output Power Adjustment

You can adjust the maximum output power level of your Magnum IIlaser. The limit has been set to its maximum value at the factory. Ifyou would like to decrease this value, use a flat screwdriver toreduce the upper limit of the output power by turning the beampower adjustment potentiometer counterclockwise—refer toFigure 2-2 (p. 2-3). To return the power to its original setting, turnthe potentiometer clockwise until it clicks. Note: you can notincrease the output power above the factory-set limit.

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Laser Operation

Operating Environment

The Magnum II laser is suitable for indoor and outdoor use and oper-ates normally when the following environmental conditions are met:

• Altitudes of up to 2000 m

• Temperature range: from – 35 to + 50°C for most models

• For temperatures up to 31°C, the maximum relative humidity(RH) can be up to 80%. Above 31°C, the accepted RHdecreases linearly from 80 to 50% (at 40°C).

Magnum II lasers contain a built-in heat sink and a thermoelectriccooler to minimize the heat build-up. Should the laser become toohot, the unit is designed to temporarily shut down. Full laser opera-tion will resume only once the laser returns within normal operatingtemperature range. This feature is intended to provide the longestlifetime and highest reliability.

The laser support should have good thermal conductive properties toefficiently dissipate the heat generated by the laser.

To allow proper ventilation, the fan should not be obstructed. Inaddition, it is suggested that you operate the laser in an environmentin which there is normal aeration.

All Coherent lasers are designed with ESD protection; however,prolonged or repeated exposure to electrostatic charges should beavoided.

A series of tests determined that the Magnum II laser belongs toCategory II with respect to over-voltage and Degree 2 with respectto pollution.

Servicing the Magnum II Laser

DANGER!As a general rule, use caution around all laser products. Lasersare extremely bright light sources, some invisible to the eye.Never point a laser beam into your or any other person’s eyes;permanent damage to the retina can occur!

WARNING!Use of controls, adjustments, or performance of proceduresother than those specified herein, may result in hazardous radi-ation exposure and will void the product warranty.

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Magnum II lasers fall in the CRDH class IIIb or class IV category,depending on output power, wavelength, and fan angle. These struc-tured light devices meet this classification only as fully-assembledunits. Use extreme caution when performing the servicing work.Never look directly into the laser beam. Coherent will not be heldliable for any injuries caused by product misuse.

Each Magnum II laser is a self-contained unit. As such, the onlynecessary service and maintenance steps are explained under“Optics and Focusing” (next) and “Cleaning the Optics” (p. 3-9).

Optics and Focusing

At long ranges, high-power laser diodes can produce beam profilesthat are far from Gaussian in shape, resulting in a beam that mayexhibit an “M”-shaped longitudinal profile with a large gap. In suchcases, it is difficult to extend the beam into a very uniform line. AtCoherent, we match each diode with a custom-made Powell lens tooptimize the line uniformity.

Coherent Magnum II lasers include a built-in focus adjustmentmechanism. To change the focus at a specified working distance,follow these instructions:

1. Loosen the locking screw. This will release the pressure on thefocusing optics, allowing the collimator to be moved.

2. Turn the focus adjustment screw clockwise or counterclock-wise to obtain the desired focus at your working distance.

3. Re-tighten the locking screw. Do not over-tighten.

4. The image should now keep the focus at the required targetdistance.

Figure 3-3. Adjusting the Focus

Top View (Focus Adjustment Screw)

Top View (Locking Screw)

Focusing Screwdriver (included)

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Laser Operation

Obtaining the smallest possible focus requires specialized equip-ment to monitor the line thickness during adjustment. It is notpossible to adjust the best focus without proper equipment. AtCoherent, our qualified personnel use state-of-the-art beamanalysis equipment to focus the beam to your specifications.

Cleaning the Optics

If the laser pattern becomes fuzzy or unclear, follow the two stepsexplained in this section.

1. Verify that the optical components have not been contami-nated:

• Turn OFF the unit.

• Keep the shutter open.

• Direct a visible light beam towards the exit aperture ofthe unit at a non-normal incidence. A flashlight with anarrow spot can be used as a light source.

• Look at the exit optical surface; dust particles or anyother contaminants are easily visible.

If the optical components are contaminated:

• The best option is to try to remove visible contaminationby blowing dry air across the exit surface. Make sure thatthe air product is oil-, moisture-, and contaminant-free.

• If blowing air fails to remove the contaminants, gentlywipe the glass surface with an optical-grade swab, lightlysaturated with isopropyl alcohol. The swab should bemoved in one direction only, preferably from top tobottom. Never swipe it back in the opposite direction.Perform this type of cleaning only after non-contactmethods have failed.

2. Check if the image is properly focused. If it isn’t properlyfocused, follow the focusing instructions explained under“Optics and Focusing” (p. 3-8).

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Product Repair

SECTION FOUR: PRODUCT REPAIR

Each Coherent laser has been designed to exhibit proper mechanicaland temperature stability. As such, no user-serviceable parts arelocated inside the laser.

NOTICE!Do not attempt to take the assembly apart—this will void theproduct warranty.

NOTICE!Coherent recommends that the shipping box and packing mate-rials be saved after initial purchase, as they will be requiredshould the laser need to be shipped or returned.

Product Shipping Instructions

To prepare the product for shipping:

1. Repack the laser in an ESD-safe bag.

2. Repack the laser in an ESD-safe foam and black box.

3. Repack the power supply in a box.

4. Place the laser and power supply in the system box.

5. Replace the top foam over the parts.

6. Close the box and tape it securely.

7. If returning the product for service, write the RMA number onthe outside of the box. To obtain an RMA number, contact ourTechnical Support Hotline at 1.800.367.7890 (1.408.764.4557outside the U.S.) or e-mail [email protected].

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mailto:[email protected]


4 - 2

Warranty

APPENDIX A: WARRANTY

For all Magnum series lasers, the warranty period shall be four thou-sand five hundred (4500) hours or eighteen (18) months (whichevercomes first). Should a product fail during this period, Coherent will,at its discretion, repair or replace the damaged unit. Repaired orreplacement units will be covered for the remainder of the originalequipment warranty period. The warranty does not apply to the unitsexamined by Coherent that are found to have failed due to abuse,acts of God, mishandling, alteration, improper installation, or negli-gence.

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Glossary

GLOSSARY

CDRH Center for Devices and Radiological Health. A regulatoryorganization that publishes legal regulations for laser productmanufacturers, applicable in the U.S.

CWAn acronym for Continuous Wave. A term used to describe theoutput of a laser emitting radiation continuously rather than in shortbursts.

Fan AngleThe (full) angle at which light “fans out” from the front of the laser,to form the image. Used to determine the “length” of a projected lineat a fixed distance from the laser source.

IECInternational Electrotechnical Commission. An organization thatpublishes the IEC 60825-1 laser safety standard.

Infrared (IR)The invisible portion of the electromagnetic spectrum that liesbetween 0.75 and 1000 µm. All IR Coherent lasers emit in the regionof 780 nm to 1550 nm (near IR).

ModulationA change in the output level generated by a change in suppliedvoltage.

Structured LightA term used in Machine Vision applications to describe any lightsource that projects a known geometric distribution of light.

VisibleThe region of the electromagnetic spectrum which is visible by thehuman eye. Light in the visible region falls between 400 and700 nm.

WavelengthElectromagnetic energy is transmitted in the form of a sinusoidalwave. The wavelength is the physical distance covered by one cycleof this wave. Wavelength is inversely proportional to the frequency.

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Glossary - 2

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