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Laser device frequency locking method based on resonant cavity

A resonant cavity and laser technology, which is applied in lasers, laser parts, phonon exciters, etc., can solve the problem of not having the advantage of carrier suppression, and achieve the effect of reducing backscatter noise and realizing carrier suppression

Inactive Publication Date: 2017-06-13
BEIHANG UNIV
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Problems solved by technology

Although this method has the characteristics of high frequency modulation, it does not have the advantage of carrier suppression

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  • Laser device frequency locking method based on resonant cavity
  • Laser device frequency locking method based on resonant cavity
  • Laser device frequency locking method based on resonant cavity

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Embodiment Construction

[0026] The present invention will be further described in detail with reference to the accompanying drawings and embodiments.

[0027] The present invention is a laser frequency-locking method based on a resonant cavity, and the process is as follows figure 1 shown, including the following steps:

[0028] Step 1: Build the experimental device;

[0029] The frequency locking device includes a light source to be locked (laser), an electro-optic modulator (EOM), a dual-channel signal generator, a resonator, a photodetector, a demodulation circuit board, an oscilloscope, and a servo feedback system;

[0030] The output light of the frequency-locked light source passes through the optical fiber optical path or the spatial optical path, and all or part of the output light is input into the electro-optical modulator, and then the electro-optic modulator is connected to a dual-channel signal generator, and one channel of the generator outputs a modulated wave signal, and passes throu...

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Abstract

The invention discloses a laser device frequency locking method based on a resonant cavity. The laser device frequency locking method comprises the following steps: step 1: establishing an experiment device; step 2: carrying out high-frequency modulation on a light path; step 3: carrying out secondary harmonic demodulation; step 4: carrying out servo feedback control; step 5: carrying out laser frequency locking. According to the laser device frequency locking method, the modulation frequency is not limited by half height and full width of the resonant cavity and influences, caused by low-frequency noises of a laser device, on the frequency locking precision are avoided; the frequency locking method provided by the invention realizes carrier suppression under the condition that the high-frequency modulation is guaranteed, and back scattering noises in the resonant cavity are reduced. A modulated light wave signal passes through a collimator lens combination or is coupled through an optical fiber coupler to enter the resonant cavity and is subjected to multiple-beam interference to obtain a strength signal related to frequency fluctuation of the laser device. The modulated signal is converted into an electric signal through a photoelectric detector and the electric signal is demodulated through a related demodulation circuit. The selection frequency of a reference signal is 2 times as much as that of the modulated signal, and secondary harmonic is used for demodulating.

Description

technical field [0001] The invention relates to a laser frequency locking method based on a resonant cavity, and belongs to the technical field of laser lock screen and resonant optical gyro. Background technique [0002] In the current application of resonant optical gyroscopes, in order to achieve carrier suppression, during the frequency locking process, the main modulation method is triangular wave or sine wave modulation with a frequency less than the full width at half maximum of the resonant cavity. With the improvement of resonant optical gyroscope scheme design and resonant cavity processing technology, the full width at half maximum of the resonant cavity is reduced, which means that the modulation frequency is reduced. However, if the modulation frequency is too low, the performance of the gyroscope will be affected by the frequency noise of the laser. Therefore, a modulation scheme with both carrier suppression and high-frequency modulation characteristics is the...

Claims

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Application Information

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IPC IPC(8): H01S3/137
CPCH01S3/137
Inventor 冯丽爽李海成王俊杰郅银周唐依创
Owner BEIHANG UNIV
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