Optical frequency shift noise suppression device and method for single-beam atom magnetometer

Abstract

The invention discloses an optical frequency shift noise suppression device and method for a single-beam atom magnetometer. The device comprises a DBR laser, an NTC thermistor and a TEC which are integrated in the laser, a laser light field regulation and control reflector path, a digital laser controller, a single-beam atom magnetometer prototype and a magnetometer control and detection unit. According to the low-frequency optical frequency shift noise suppression method based on precise control over the temperature of the DBR laser, the stability margin of a temperature control loop is improved by adopting an III-type compensation network according to the frequency response characteristic of the temperature control loop of the laser, low-frequency fluctuation of the temperature of the laser is eliminated, fine thermal tuning of the laser wavelength is achieved, and the low-frequency optical frequency shift noise suppression method based on precise control over the temperature of the DBR laser is achieved. Therefore, low-frequency optical frequency shift noise caused by temperature fluctuation of the laser in the single-beam atom magnetometer is suppressed, and the problem of low-frequency magnetic field measurement sensitivity deterioration of the magnetometer is solved. According to the invention, the low-frequency performance of the single-beam atom magnetometer can be effectively improved, and the low-frequency biological weak magnetic information extraction of the single-beam atom magnetometer is facilitated.

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