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Ultra-Stable Lasers

Dr. Randy Bartels supervises a project focused on creating ultra-stable external cavity diode lasers (ECDL) for applications in precision clocks, telecommunications, and navigation. Key goals include developing electronics for the ECDL system, including components such as thermoelectric controllers, power supplies, and diode drivers. The project aims to integrate and build ECDL components, assemble the system, and calibrate electronics to achieve a stable optical frequency comb output. Team members include Steven Dorlac, Andrew Wiersma, Daxsamuel Chitechi, and Derrick Bernallie.

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Ultra-Stable Lasers

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  1. Ultra-Stable Lasers Supervisor Dr Randy Bartels Team Members Steven Dorlac, Andrew Wiersma, DaxsamuelChitechi, Derrick Bernallie

  2. 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)

  3. 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 Current Controller

  4. Ultra-Stable Lasers Semester Goals and Assignments • Develop ECDL electronics • Diode Driver: Andy Wiersma • TEC: DaxChitechi • Power Supply: Derrick Benallie • Control/Filter: Steven Dorlac

  5. 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 Current Controller

  6. Current Controller Overview

  7. Current Controller Key Parts • Supply Source • Circuit Feedback • Current Line • Output to Diode

  8. Thermoelectric Controller • Maintain the ECDL at constant temperature. • Typical inputs: • Thermistor & thermocouple • Typical outputs: • Peltier cooler & heater TEC

  9. Thermoelectric controller overview

  10. Thermoelectic Controller Key Parts • Low power low cost 2.5V reference • Gain stage • Peltier cooling and heating stage

  11. Power Supply • Supplies Power other Circuits • General power • TEC • PZT PS • Current Controller • Cost effective to simply purchase PSU

  12. Pulsed Power Supply • 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 PZT PS

  13. Pulsed Power Supply

  14. Pulsed Power Supply • More efficient • Carefully designed not to have high power peaks

  15. Control/Filter Electronics • Stabilizes ECDL Frequency • Can be cascaded • Typical Inputs • Photodetector • Typical Outputs • Piezo Disc • Adjusts External Cavity • Diode Driver • Adjusts Current to Diode Control

  16. Control/Filter Electronics Key Components Mode Selection Signal In PI Input Monitor Control Out

  17. Budget • Current Controller Parts: $138.43 • Thermoelectric Cooling Parts: $76.15 • Power Supply Parts: $133.77 • 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

  18. Review • ECDL Circuits • Connections • Purpose • Features Current Controller

  19. 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

  20. Thanks for Listening Any Questions?

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