Atomic magnetometer detection light frequency measuring and stabilizing device and method based on second harmonic

Abstract

The invention discloses an atomic magnetometer detection light frequency measuring and stabilizing device and method based on second harmonic. According t the method, based on the optical absorption effect and dispersion effect of an alkali metal atom gas chamber for detection laser and optical effects (such as an electro-optic effect, a magneto-optical effect, and a photoelastic effect) of a phase modulator, through monitoring a second harmonic signal outputted by an atomic magnetometer optical detection system, the detection light frequency is calculated in real time, with a servo controller and a closed-loop control algorithm, a control signal is fed to a detection light source control module to carry out corresponding adjustment, and the frequency online measurement of large detuning detection light and long time closed loop stability are realized. According to the device and the method, the advantages of system simplification, a small size, application range enlargement, real-time measurement and feedback are developed, the improvement of the sensitivity and stability of a miniaturized and integrated atomic magnetic field measurement device is facilitated, and the device and the method can be used for the industrial integration and practical application of a quantum sensing instrument such as an atomic magnetometer in the future.

Description

technical field [0001] The invention relates to the technical field of quantum instruments and precision measurement, in particular to a device and method for measuring and stabilizing the frequency of light waves detected by an atomic magnetometer based on a second harmonic wave, which can be widely used in the future for research on material forms and properties, and geological exploration The development of a new generation of miniaturized and integrated ultra-high sensitivity magnetic field devices based on quantum effects has important practical significance and application value in many fields such as resource development, biomedical diagnostic analysis, material process testing, and underwater magnetic target positioning. Background technique [0002] With the major breakthroughs in some key physical theories and technologies in recent years, the application of quantum technology has received unprecedented attention. As a branch of quantum technology, quantum sensing ...

AI Technical Summary

Problems solved by technology

However, for the pumping of the atomic magnetometer and the frequency of the detection laser, a certain amount of detuning is required, especially the detection laser usually needs detuning of tens of GHz or even hundreds of GHz to achieve the maximum value of the system output signal

In addition to using the wavelength meter to detect the laser frequency of the sub-path for closed-loop feedback frequency stabilization, other frequency stabilization methods are difficult to apply to such a large frequency detuning situation, and the wavelength meter method brings system complexity and cost.

Miniaturized atomic magnetometers still generally adopt the open-loop method. Only using the temperature control and current control of the laser itself, it is difficult to guarantee the long-term stability of the frequency, and it is necessary to regularly calibrate and Adjustment

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