Automatic compensation device of phase noise of Raman laser system based on closed loop feedback and method thereof

Abstract

The invention discloses an automatic compensation device of a phase noise of a Raman laser system based on closed loop feedback and a method thereof. The device comprises a laser source, a beam splitter, an electrooptical modulator, an acoustic optical modulator, a beam combiner, a half-transparent half-reflecting mirror, a phase modulator, a polarizer, a photoelectric detector, a low noise microwave amplifier, a frequency mixer, a low pass filter, an analog-digital converter, an FPGA, a digital-to-analog converter, a low frequency amplifier and a phase shifter. The automatic compensation device and method provided by the invention are capable of automatically adjusting and compensating a phase difference in the Raman laser system and reducing the phase noise caused by the vibration of a light path of the Raman laser system. By adopting the circuit control mode, the advantages of integration, modularization and easy debugging of a control system are achieved.

Description

Technical field [0001] The invention relates to a closed-loop feedback-based Raman laser system phase noise automatic compensation device and method, and belongs to the technical field of atomic interferometers. Background technique [0002] The atomic interferometer is based on the principle of matter wave interference, using laser to split, reflect, and combine the cold atomic beam to achieve atomic interference. The atomic interferometer can accurately measure physical constants and test basic physical theories such as quantum mechanics and general relativity. Due to the mass of atoms, the atomic interferometer can also be used as a sensitive inertial sensor, which can accurately measure the acceleration of gravity, angular velocity, etc., thus having important applications in navigation, prospecting, earthquake prediction, and environmental monitoring. [0003] Raman lasers are usually used to split, reflect and combine atomic beams. Raman lasers are two lasers with a fixed f...

AI Technical Summary

Problems solved by technology

[0004] The phase noise caused by the vibration of optical devices in the optical path has a certain impact on the phase noise of the Raman laser system. In order to reduce the phase noise of the Raman laser system as much as possible, the traditional method is to passively isolate the laser system or use an accelerometer The vibration and noise are measured, and finally compensated during the measurement. Obviously, the above compensation method is more complicated, and additional devices are required to assist in the measurement

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