Optical frequency comb generation device and light source frequency stabilization system and method of atomic magnetometer

Abstract

The invention discloses an optical frequency comb generation device, which comprises a tunable laser, a micro-nano optical fiber and a peanut-shaped resonant cavity, laser emitted by the tunable laser is coupled into the peanut-shaped resonant cavity through the micro-nano optical fiber and forms an optical frequency comb, and the peanut-shaped resonant cavity is prepared by melting and compressing a single-mode optical fiber twice. The outline of the peanut-shaped resonant cavity is in axial symmetry, the peanut-shaped resonant cavity comprises a first bottle-shaped optical microcavity and a second bottle-shaped optical microcavity which are coaxially arranged in the axial direction of the peanut-shaped resonant cavity, and the first bottle-shaped optical microcavity and the second bottle-shaped optical microcavity are partially overlapped in the axial direction. The invention also provides a light source frequency stabilization system and a method of the atomic magnetometer. The comb tooth interval of the optical frequency comb obtained by the optical frequency comb generation device is as low as 0.1-1GHz, dispersion is easy to adjust, and the light source frequency stabilization system and method of the atomic magnetometer based on the optical frequency comb generation device realize high-precision and high-frequency-stability light source output of the atomic magnetometer.

Description

technical field [0001] The invention relates to the technical field of quantum precision measurement, in particular to an optical frequency comb generating device and a light source frequency stabilization system and method for an atomic magnetometer. Background technique [0002] Atomic magnetometers are widely used in medical equipment, geological exploration, safety detection, military defense and other fields. The stability of the output frequency of the light source has very important research significance and practical value for improving the sensitivity of magnetic field detection. Currently widely used frequency stabilization techniques include the Lamb sag frequency stabilization method locked to the atomic transition center frequency, the Zeeman effect frequency stabilization method, the saturation absorption frequency stabilization locked to the atomic or molecular absorption line, and the atomic two-way chromaticity frequency lock. And the Pound-Drever-Hall (PDH)...

AI Technical Summary

Problems solved by technology

Although the existing frequency stabilization methods based on optical frequency combs have good stability and reproducibility, the optical frequency comb generators based on mode-locked lasers have complex structures and large volumes, which are not conducive to system integration and practical applications. The threshold power of the optical frequency comb of the nanofiber multi-turn resonator is high, and the economy is poor

Whispering gallery mode optical microcavity is an optical resonant cavity whose size is on the order of microns. It has the advantages of high quality factor, small mode volume, and high energy density. It is an ideal carrier for generating optical frequency combs. The tooth interval of the optical frequency comb of the disc-shaped, micro-ring core, bottle-shaped and other resonant cavities is usually 10-100 GHz, and it is difficult to continue to reduce due to the limitation of the diameter of the microcavity. The larger frequency interval of the optical frequency comb reduces the frequency of the beat signal. Calculation accuracy increases the difficulty of signal locking and frequency stabilization

In addition, the modal dispersion of these microcavities is not easy to adjust, which limits the further broadening of the effective spectral range of optical frequency combs. Therefore, it is urgent to find a new method and device for optical frequency comb generation to solve the existing problems

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