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Long-term digital frequency-stabilized laser source for large-scale passive laser gyroscopes.

Fenglei Zhang1, Kui Liu1, Zongyang Li1

  • 1MOE Key Laboratory of Fundamental Physical Quantities Measurements & Hubei Key Laboratory of Gravitation and Quantum Physics, PGMF and School of Physics, Huazhong University of Science and Technology, 430074 Wuhan, China.

The Review of Scientific Instruments
|February 5, 2020
PubMed
Summary

We developed a digitally controlled ultrastable laser source for a passive resonant gyroscope. This laser achieves high frequency stability, crucial for precise measurements in gravity research and space missions.

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Area of Science:

  • Physics
  • Optical Engineering
  • Metrology

Background:

  • Passive resonant gyroscopes require highly stable injection lasers for precise perimeter stabilization.
  • Operating gyroscopes at multiple cavity modes necessitates enhanced laser frequency stability, as laser wavelength acts as the length standard.
  • Previous laser stabilization methods faced limitations in long-term stability and autonomous operation.

Purpose of the Study:

  • To develop a digitally controlled, long-term frequency stabilized ultrastable laser source.
  • To enhance the performance and reliability of a heterolithic passive resonant gyroscope.
  • To enable autonomous operation of the laser system for extended periods.

Main Methods:

  • Digitally locking a laser source to a high-finesse Fabry-Perot cavity and a femtosecond optical frequency comb simultaneously.
  • Referencing the frequency comb to an active hydrogen maser for absolute frequency accuracy.
  • Implementing a digital control system for autonomous laser operation and rapid relocking.

Main Results:

  • Achieved fractional frequency stability better than 1.2 × 10⁻¹⁴ for averaging times from 0.1 s to 10,000 s.
  • Demonstrated autonomous laser operation for weeks with relocking times within seconds.
  • Identified the Fabry-Perot cavity as the limiting factor for short-term stability and the frequency comb for long-term stability.

Conclusions:

  • The developed digitally controlled laser source meets stringent stability requirements for advanced gyroscope applications.
  • The digital frequency stabilization technique is suitable for demanding applications like space gravitational wave detection and gravity recovery missions.
  • This technology advances precision measurement capabilities in fundamental physics and space exploration.