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Laser frequency combination tuning and locking technology in resonant optical gyro

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Abstract

Generally, resonant optical gyroscopes (ROG) based on the Sagnac effect are very sensitive to the changes of temperature and optical power, which directly affects the output of the gyroscope. To improve the frequency lock-in accuracy and thermal stability of ROG system, the technology of laser frequency combination tuning and locking is proposed and experimentally demonstrated. Using the characteristics of voltage and temperature tuning wavelength of semiconductor laser, the output frequency range of laser is increased, the temperature control system of the resonant cavity can be removed and the gyro can never be unlocked in theory. In addition, the frequency lock-in accuracy under light power fluctuation is improved. Using this technique, a long-term (1-h) bias stability of 24.7 °/h is observed. Moreover, the weight and volume of the ROG are greatly reduced.

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Abbreviations

ROG:

Resonant optical gyroscope

FRR:

Fiber ring resonator

WRR:

Waveguide ring resonator

FSR:

Free spectral range

CW:

Clockwise

CCW:

Counterclockwise

FLRP:

Frequency lock reference point

RIM:

Residual intensity modulation

PD:

Photoelectric detector

LIA:

Lock-in amplifier

SG:

Signal generator

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Funding

Natural National Science Foundation of China (NSFC) (No. 61803350,51635011 and 51727808); Science and Technology on Underwater Information and Control Laboratory (No. 6142218051810); Applied Basic Research Program in Shanxi Province (201901D211240, 201801D221202); Key Research and Development Program in Shanxi Province (201803D121067); Shanxi “1331 Project” Key Subjects Construction.

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Authors and Affiliations

  1. Key Laboratory of Instrumentation Science and Dynamic Measurement Ministry of Education, North University of China, Taiyuan, 030051, China

    Shihao Yin, Wenyao Liu, Ziwen Pan, Yu Tao, Jiangbo Zhu, Jun Tang & Jun Liu

Authors
  1. Shihao Yin
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  2. Wenyao Liu
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  3. Ziwen Pan
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  4. Yu Tao
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  5. Jiangbo Zhu
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  6. Jun Tang
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  7. Jun Liu
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Correspondence to Wenyao Liu or Jun Liu.

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Yin, S., Liu, W., Pan, Z. et al. Laser frequency combination tuning and locking technology in resonant optical gyro. Appl. Phys. B 126, 70 (2020). https://doi.org/10.1007/s00340-020-07421-8

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  • DOI: https://doi.org/10.1007/s00340-020-07421-8

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