Laser-stabilized SERF atom magnetometer signal detection system based on acousto-optic modulation

Abstract

The invention discloses a laser-stabilized SERF atom magnetometer signal detection system based on an acousto-optic modulator, and the system can achieve the great improvement of the laser power stability and laser pointing stability through the closed-loop feedback control and system optical path design based on the modulation and diffraction effects of the acousto-optic modulator on incident laser; and the signal detection function of the SERF atom magnetometer is achieved by combining the modulation effect of the frequency-adjustable pulse optical switch of the acoustic optical modulator. The system is mainly composed of a laser, an acoustic optical modulator, a beam splitter, a polarization splitting prism, a proportional integral differential (PID) controller, a photoelectric detector, a balance photoelectric detector, a signal generator, a data acquisition and analysis system and an SERF atom magnetometer system. The laser-stabilized SERF atom magnetometer signal detection systemhas the advantages of being small in size, easy and convenient to debug, excellent in laser stability, low in system noise, small in environmental influence and high in modulation sensitivity, and the measurement sensitivity of the SERF atomic magnetometer and instrumentation and miniaturization of the SERF atomic magnetometer can be improved.

Description

technical field [0001] The invention belongs to the technical field of precision measurement, in particular to a laser-stabilized SERF atomic magnetometer signal detection system based on acousto-optic modulation. Background technique [0002] At present, SERF (Spin Exchange Relaxation Free) atomic magnetometers widely use external-cavity semiconductor lasers with a large tuning range and stable frequency due to special requirements for the optical frequency and polarization state of the pumping / detection laser. , but as a high power density device, fluctuations in current and temperature will directly lead to changes in the optical power of the laser, affecting the accuracy and stability of the output. At present, the output power stability of semiconductor lasers for scientific research is usually 1% to 5%. About / h, milliwatt-level laser power fluctuations cannot meet the low-noise requirements of the atomic magnetometer laser; in addition, when the laser is working, due ...

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Problems solved by technology

The drift of the laser pointing will also affect the interaction between the laser and the alkali metal atoms of the measurement device, thereby affecting the magnetic measurement sensitivity of the SERF atomic magnetometer

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