tandem fabry-perot interferometer tfp- tfp-2 hc.pdf  high contrast tandem fabry-p‰rot...

Download TANDEM FABRY-PEROT INTERFEROMETER TFP- TFP-2 HC.pdf  HIGH CONTRAST TANDEM FABRY-P‰ROT INTERFEROMETER

Post on 20-Jun-2019

230 views

Category:

Documents

1 download

Embed Size (px)

TRANSCRIPT

HIGH CONTRAST TANDEM FABRY-PROT INTERFEROMETER

TFP-2 HC

Operator Manual

Im Grindel 6 8932 Mettmenstetten-Switzerland Phone: +41 (0) 44 776 33 66 Fax: +41 (0) 44 776 33 65 E-Mail: info@tablestable.com Internet: www.tablestable.com

2

Table of contents Safety instructions ................................................................................................................... 4 1 INTRODUCTION TO FABRY-PROT INTERFEROMETRY ............................................... 5

1.1 Properties of Fabry-Prot Interferometer ...................................................................... 5 1.2 Traditional Design of FP and Related Problems ........................................................... 6

1.2.1 Non-linear scan ......................................................................................................... 7 1.2.2 Mirror tilt .................................................................................................................... 7 1.2.3 Tedious to change mirror spacing ............................................................................. 7 1.2.4 Stability ..................................................................................................................... 7 1.2.5 The device is not suited for tandem operation ........................................................... 7

1.3 Novel Parallelogram Construction ................................................................................ 8 1.3.1 The compound translation stage ............................................................................... 9 1.3.2 Measurement transducer for mirror spacing .............................................................. 9

1.4 Tandem Interferometry ............................................................................................... 10 1.5 A practical Design of Scanning Tandem FP................................................................ 11 1.6 Vibration Isolation ....................................................................................................... 13 1.7 Prealignment of the Interferometer ............................................................................. 14 1.8 Stabilizing the Fabry-Prot ......................................................................................... 15 1.9 Improved Optical Path for High Contrast Operation in the TFP-2 HC ......................... 15

2 OPTICAL SYSTEM FOR TANDEM TRIPLE-PASS OPERATION .................................... 16 2.1 Description of the New High Contrast Optics for the TFP-2 HC .................................. 16 2.2 Quarter Wave Optics .................................................................................................. 16 2.3 Description of the Optical System ............................................................................... 18

2.3.1 Tandem mode optics description............................................................................. 18 2.3.2 Alignment mode optics description .......................................................................... 18

2.4 Rotating Notch Filter Usage (for use with the CM-1 Microscope Appendix) ................ 20 3 ASSEMBLY AND OPERATION OF INTERFEROMETER ................................................ 21

3.1 Instrument Unpacking and Checking .......................................................................... 21 3.1.1 Adjustment or reset of transducer ........................................................................... 22 3.1.2 Further check of control unit .................................................................................... 23

3.2 Operation of Isolation System ..................................................................................... 24 3.3 Mounting the Mirrors in the Interferometer .................................................................. 25 3.4 Instrument Block Diagram and Connections ............................................................... 27

3.4.1 Interferometer control unit ....................................................................................... 28 3.4.2 Interferometer control unit rear panel connectors .................................................... 30 3.4.3 Controls available on the interferometer enclosure ................................................. 31 3.4.4 Familiarizing yourself with the tandem interferometer .............................................. 32 3.4.5 Use of the detector and of the MCA GHOST data gathering system ....................... 33 3.4.6 Changing the mirror spacing ................................................................................... 33 3.4.7 Motor compensation of PZT drift ............................................................................. 34 3.4.8 Learning to use the scan control ............................................................................. 34 3.4.9 Window operation ................................................................................................... 37 3.4.10 Scanning the Tandem Interferometer ...................................................................... 38

3.5 A Test to Check the Correct Operation of the System ................................................ 40 3.6 Some Notes for Starting a New Measurement ............................................................ 40 3.7 Photon Counting Limit, Detector Linearity and Saturation ........................................... 41 3.8 Polarisation Selectivity in the TFP-2 HC ..................................................................... 42 3.9 Alignment of Optical System and Occasional Checks ................................................. 42 3.10 Choice of Pinhole Size ............................................................................................... 43 3.11 Optics for Backscattering ............................................................................................ 44 3.12 Calibration of Mirror Spacings .................................................................................... 45

4 USER ADJUSTMENTS OF ELECTRONICS ..................................................................... 46

3

4.1 Adjustment of Scan Board .......................................................................................... 46 4.2 Further Adjustments ................................................................................................... 48

4.2.1 Adjustment of LCD display of scan amplitude ......................................................... 48 4.2.2 Adjusting the Z scan movement ............................................................................ 48

4.3 Adjustment of Capacitance Range and Centring of Scan Amplitude Indicator ............ 49 4.4 Control Unit - External Connectors ............................................................................. 51 4.5 Interferometer Control Unit Remote Control Inputs ..................................................... 53

5 CIRCUIT DIAGRAMS ........................................................................................................ 54 5.1 Scan Board................................................................................................................. 54 5.2 Stabiliser Memory ....................................................................................................... 55 5.3 PZT Driver Circuitry .................................................................................................... 56 5.4 HV Amplifier ............................................................................................................... 57

6 TROUBLESHOOTING ...................................................................................................... 58 7 APPENDIX ........................................................................................................................ 61

7.1 Specifications of Tandem Fabry-Prot Interferometer ................................................. 61 7.2 Preparing the TFP-2 HC Interferometer for Shipping .................................................. 62 7.3 A Light Source for Alignment and Calibration ............................................................. 66 7.4 Alignment of Reference Beam .................................................................................... 68

7.4.1 Alternative alignment procedure .............................................................................. 69 7.5 Alignment of Optics .................................................................................................... 70 7.6 Fine Check of Incidence Angles Using Interference Fringes ....................................... 78 7.7 Calibration of Mirror Spacings .................................................................................... 79

7.7.1 First calibration of mirrors spacings using interference rings ................................... 79 7.7.2 Precise calibration of mirror spacings using conical lens, gauge adjustment ........... 82

7.8 Cleaning the Mirrors ................................................................................................... 85

V-1703/1.5

4

SAFETY INSTRUCTIONS The system may only be plugged into a socket with separate ground. Do not disconnect this ground, either at the socket, or by using an ungrounded extension cable. If you suspect the system to be in any way unsafe, unplug and prevent any possible accidental usage. Contact your nearest service centre. Before switching on this apparatus make sure that it is connected to the correct mains voltage. Do not remove any cover or allow any metal objects to enter the ventilation slits. Disconnect from

Recommended

View more >