ultra-stable lasers supervisor dr randy bartels team members steven dorlac, andrew wiersma,...
TRANSCRIPT
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Ultra-Stable Lasers
Supervisor
Dr Randy Bartels
Team MembersSteven Dorlac, Andrew Wiersma, Daxsamuel Chitechi, Derrick Bernallie
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Ultra-Stable Lasers
Project Overview• Develop an Optically-Based Clock– Ultra-Stable External Cavity Diode Laser (ECDL)• Stable Optical Frequency Comb
(image shown on right)
• Driving/Stabilizing Electronics– Applications
• Precision Clocks• Telecommunications• Precision Navigation Source: Encyclopedia of Laser Physics and
Technology (website)
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Ultra-Stable Lasers
ECDL System Overview• Key Components
– External Cavity Diode Laser– Thermoelectric Control (TEC)– Power Supply (PSU)– Piezo-Electric Power Supply
(PZT PS)– Diode Driver– Loop Control/Filter– Optics
PSUTEC
ControlOptics
ECDL
Stable Light
PZT PS
Current Controller
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Ultra-Stable Lasers
Semester Goals and Assignments• Develop ECDL electronics– Diode Driver: Andy Wiersma
– TEC: Dax Chitechi
– Power Supply: Derrick Benallie
– Control/Filter: Steven Dorlac
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Current Controller
PSUTEC
ControlOptics
ECDL
Stable Light
PZT PS
Current Controller
• Supplies a very low noise current to the LASER diode
• Typical Inputs– Power Supply
• Supplies power to the Current Driver to produce a current
– Servo Circuit• Provides feedback to the Current
Driver to compensate for changes
• Typical Outputs– Laser Diode
• Supplies Current to the Diode
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Current Controller Overview
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Current Controller Key Parts
1) Supply Source
2) Circuit Feedback
3) Current Line4) Output to
Diode
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Thermoelectric Controller
PSU Current Controller
ControlOptics
ECDL
Stable Light
PZT PS
TEC
• Maintain the ECDL at constant temperature.
• Typical inputs:– Thermistor &
thermocouple
• Typical outputs:– Peltier cooler & heater
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Thermoelectric controller overview
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Thermoelectic Controller Key Parts
1) Low power low cost 2.5V reference
2) Gain stage3) Peltier
cooling and heating stage
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Power Supply
PZT PS
TEC
ControlOptics
ECDL
Stable Light
Current Controller
PSU
• Supplies Power other Circuits – General power
• TEC• PZT PS• Current Controller
• Cost effective to simply purchase
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Pulsed Power Supply
PSUTEC
ControlOptics
ECDL
Stable Light
Current Controller
PZT PS
• Supplies Power to the PZT Driver – Provides high voltage supply
to supply to PZT
• Piezoelectric Disc– Mounted to back of optical
mirrors– Changes Cavity Length
• Changes output freqency
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Pulsed Power Supply
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Pulsed Power Supply
• More efficient • Carefully designed not
to have high power peaks
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Control/Filter Electronics
PSUTEC Current Controller
Optics
ECDL
Stable Light
PZT PS
Control
• Stabilizes ECDL Frequency• Can be cascaded• Typical Inputs
– Photodetector
• Typical Outputs– Piezo Disc
• Adjusts External Cavity
– Diode Driver• Adjusts Current to Diode
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Control/Filter Electronics
Key Components
Input Monitor
PI
Mode Selection
Signal In
Control Out
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Budget1) Current Controller Parts: $138.432) Thermoelectric Cooling Parts: $76.153) Power Supply Parts: $133.774) Loop Electronics Parts: $109.31-Total for parts so far:$457.67 -Amount coming in from senior design: $350-We plan on getting the rest of our funding from Prof. Bartels for the PCB and any extra costs we come across -PCB: ~$50 for each circuit= $200-One major expense we still have other than the PCB is two EMCO model G03 which we are currently looking for more affordable alternative replacement parts
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Review
• ECDL Circuits– Connections– Purpose– Features
PSUTEC
ControlOptics
ECDL
Stable Light
PZT PS
Current Controller
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Next Semester Plans/Goals
• Design, Integrate and Build ECDL components– Diode Housing, External Cavity, Mirrors, Gratings, Piezo Discs,
Photodetector
• Assemble ECDL system– Attach electronics– Setup and calibration of electronics
• Achieve stable optical comb output from ECDL
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Thanks for Listening
Any Questions?