A laser frequency stabilization system for nuclear magnetic resonance gyro

Abstract

The invention belongs to the technical field of laser, and discloses a laser frequency stabilization system for a nuclear magnetic resonance gyroscope. The laser frequency stabilization system mainlycomprises a balance detector, a photoelectric detector, a laser frequency stabilization signal processing system and a nuclear magnetic resonance gyroscope basic system. A high-frequency small-amplitude modulation signal outputted by the laser frequency stabilization signal processing system is inputted into the injection current modulation port of the detection light laser; the a + port of the balance detector outputs a modulated optical detection signal and then feeds back and inputs the modulated optical detection signal to the laser frequency stabilization signal processing system, a PID feedback control signal is generated after the modulated optical detection signal is processed by the laser frequency stabilization signal processing system, and finally, the frequency of the detectionlight is locked at the extreme point of the spectral signal; the frequency stabilization method of the pump light is the same as the frequency stabilization method of the probe light, and the frequency of the pump light is locked at the extreme point of the spectral signal. The system is simple in design structure and easy to apply to the nuclear magnetic resonance gyroscope, and frequency stabilization of the pump light and the detection light can be realized only by utilizing the device conditions of the gyroscope system without externally building a frequency stabilization optical system.

Description

Technical field: [0001] The invention belongs to the field of laser technology, and relates to a laser frequency stabilization system, in particular to a laser frequency stabilization system for nuclear magnetic resonance gyroscopes. Background technique: [0002] Nuclear Magnetic Resonance Gyroscope (NMRG) is a high-performance inertial navigation sensor based on atomic spin. It is considered to be one of the main development directions of high-precision and small-size gyroscopes in the future. the key of. [0003] In the NMR gyroscope, the role of the pump light is to polarize the atomic spin, and the absorption of the pump light photons by the atom is related to the frequency of the pump light. Therefore, the instability of the pump light frequency will cause the atomic spin polarity The fluctuation of gyroscope will lead to the decrease of gyroscope accuracy. The role of the probe light is to extract the nuclear spin precession information of the noble gas by detecting...

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Problems solved by technology

[0004] The commonly used laser frequency stabilization method is the saturated absorption frequency stabilization method, but this requires the construction of two sets of optical systems outside the gyro system to realize the laser frequency stabilization of the pump light and the probe light, which will expand the gyro system. The scale makes the gyro system more complicated, which is not conducive to the development of miniaturized nuclear magnetic resonance gyro

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