A Fiber Laser Frequency Stabilization System Using Fast and Slow Locking

A fiber laser and frequency stabilization technology, which is applied to lasers, laser components, phonon exciters, etc., can solve the problems of limiting frequency stability, complex fiber optical path structure, and slow tuning response of lasers, etc., to improve frequency stabilization accuracy , suppression of phase noise, and the effect of highly stable fiber laser output

Active Publication Date: 2022-03-18
HARBIN ENG UNIV
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Problems solved by technology

The tuning response of lasers tends to be slow, limiting the effectiveness of frequency stabilization
In the patent CN106159667B, a laser frequency stabilization system with dual interferometers is proposed. Two fiber optic interferometers with different time delays are used as references for the laser frequency, and a single feedback loop is used to complete the frequency stabilization of the fiber laser. This solution has a complex fiber optic path structure. Single feedback loop limited by light source tuning response

Method used

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  • A Fiber Laser Frequency Stabilization System Using Fast and Slow Locking
  • A Fiber Laser Frequency Stabilization System Using Fast and Slow Locking
  • A Fiber Laser Frequency Stabilization System Using Fast and Slow Locking

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Embodiment 1

[0023] Embodiment 1: A kind of fiber laser frequency stabilization scheme using fast and slow locking proposed by the present invention, including ultra-narrow linewidth light source and modulation module 1, Fabry-Perot resonator 2 based on fiber Bragg grating, orthogonal solution Tuning module 3, feedback control module 4,

[0024] 1) The ultra-narrow linewidth light source is directly connected to the modulated light output of the modulation module 1 and the polarization-maintaining optical fiber circulator 001 at the rear end;

[0025] 2) The Fabry-Perot resonator 2 based on the fiber Bragg grating is connected to the polarization-maintaining fiber circulator 001 through the polarization-maintaining fiber 201;

[0026] 3) The photodetector 003 is connected to the polarization maintaining optical fiber circulator 001 through the polarization maintaining optical fiber 002;

[0027] 4) The photodetector 003 is an anti-aliasing balanced photodetector with smooth filtering;

...

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Abstract

The invention provides a fiber laser frequency stabilization system using fast and slow locking, which includes an ultra-narrow linewidth fiber laser, an acousto-optic modulator, a phase modulator, a quadrature demodulation device and a feedback control device. It is characterized in that the laser output from the ultra-narrow linewidth fiber laser is modulated by an acousto-optic modulator and a phase modulator in sequence. After being input into a fiber grating Fabry-Perot interference cavity through a circulator, it is demodulated through a quadrature demodulation circuit. The slow PID controller is used to adjust the wavelength of the light source to compensate low frequency signals; the fast PID controller is used to adjust the acousto-optic modulator to compensate high frequency signals. This scheme can overcome the limitations of the frequency modulation response and frequency modulation bandwidth of the fiber laser, and realize the stable tracking between the output wavelength of the fiber laser and the reference resonant cavity.

Description

technical field [0001] The invention relates to a fiber laser frequency stabilization system using fast and slow locking, and belongs to the technical field of laser frequency stabilization. Background technique [0002] Lasers have important applications in fields such as interferometry, lidar, and gravitational wave detection. Compared with space lasers, fiber lasers have the characteristics of small size, easy integration, and wide tuning range, and are widely used in the field of fiber optic sensing and measurement. In order to meet the limit measurement in the field of fiber optic sensing, the frequency stability of fiber lasers is challenged. Therefore, people have proposed many fiber laser frequency stabilization schemes, such as polarization spectroscopy, Sagnac interferometry, and PDH frequency stabilization technology, to obtain error signals at the reference standard frequency by analogy to space lasers with relatively mature frequency stabilization technology. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/13H01S3/137H01S3/067H01S3/10H01S3/106
CPCH01S3/1305H01S3/137H01S3/1068H01S3/0675H01S3/10
Inventor 张羽金威张亚勋刘志海杨军苑立波
Owner HARBIN ENG UNIV
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