All-fiber power-stable and modulatable NV color center sensing magnetic measurement system and method

Abstract

The invention discloses an all-fiber stable-power modulatable NV color center sensing magnetic measurement system and method. The stability of the power of a laser and the pulse modulation of different time sequences of excitation laser are realized by controlling an acoustic optical modulator. The device is composed of an optical fiber laser, an optical fiber acousto-optic modulator, a polarization beam splitter, a photoelectric detector, a feedback adjusting system and the like, first-order diffraction light emitted by the acousto-optic modulator is split into one beam, and the beam, a low-pass filter circuit, a proportion-integral-differential controller and the like form a closed feedback system to adjust laser power in real time; the problem of power fluctuation of excitation laser in the system is solved, and the measurement sensitivity of the system is improved. According to the system, the same acousto-optic modulator is adopted, laser power stabilization and a pulse optical switch function are achieved at the same time, a complex optical path is prevented from being introduced into a main optical path of a diamond NV color center fluorescence excitation and detection system, an optical system is of an all-fiber optical structure, stability and adjustability are achieved, and integration and miniaturization of the device are facilitated.

Description

technical field [0001] The invention relates to the technical field of laser power stabilization, in particular to an all-fiber type power stable and adjustable NV color center sensing magnetic measurement system and method. Background technique [0002] Sensing measurement research including magnetic field and inertial measurement based on diamond NV color center ensemble is one of the development directions of miniaturized quantum sensing measurement at present. As the light source of the laser excitation and fluorescence detection system in the diamond NV color center ensemble sensing and measurement device, the solid-state laser's frequency and power are easily fluctuated by temperature and mechanical factors, and the stability of the laser power must be improved. The sensing measurement experiment using the diamond NV color center ensemble needs to be based on the pulsed polarization, manipulation and detection of the electron spin ensemble, so the sensing measurement e...

AI Technical Summary

Problems solved by technology

Due to the use of two acousto-optic modulators, the complexity of the entire optical path and circuit is increased, which is not conducive to miniaturization; and the stability requirements for the second acousto-optic modulator driver are very high, which is not conducive to the realization of

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