A method and device for detecting atomic spin precession based on electro-optical modulation

Abstract

The invention relates to an atomic spin procession detecting method and an atomic spin precession detecting device based on electro-optic modulation. Alkali metal atoms in a spin-exchange relaxation free state are used for sensing an external magnetic field or angular rate, thereby generating atomic spin Larmor precession. An electro-optic modulator is used for performing electro-optic modulation on detected laser. Through output light strength detection by the electro-optic modulator and demodulation of a phase-locked amplifier, output light strength and frequency doubling signal strength are obtained. Finally a signal acquisition and processing circuit measures an atomic spin precession signal, and furthermore measurement to the external magnetic field or inertia can be realized. According to the atomic spin procession detecting method and the atomic spin procession detecting device, advantages such as simple modulation, small size, high sensitivity, low temperature effect and simple operation condition in the electro-optic modulator are exerted. The atomic spin procession detecting method and the atomic spin procession detecting device have relatively high sensitivity and relatively high stability. The novel atomic spin procession detecting method is based on an atomic spin effect and can be used for industrial integration and practical application of atomic spin sensing devices in future.

Description

technical field [0001] The invention relates to the technical field of quantum instruments and measurements, in particular to a method and device for detecting atomic spin precession based on electro-optic modulation, which is useful for the development of a new generation of miniaturized and integrated ultra-high sensitivity magnetic fields and magnetic fields based on atomic spin effects. Inertial measurement devices have important significance and value, and will serve the magnetic field and inertial measurement applications in various fields in the future, especially in basic physical research, geological exploration, military defense, and biomedicine. Background technique [0002] Since the end of the 1990s, atomic manipulation and sensing and related technologies have developed rapidly. The atomic manipulation, sensing and measurement technology using atoms as sensitive media has won many awards in recent years (1997, 2001, 2005 and 2010). The Nobel Prize in Physics ha...

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Problems solved by technology

However, the differential polarization method has poor low-frequency response due to lack of modulation; the Faraday modulation method uses a coil to generate a variable magnetic field, which requires magnetic shielding and temperature-controlled closed-loop feedback; the photoelastic modulation method is also difficult to implement due to its complex mechanical structure and control equipment. Miniaturization and integration of atomic magnetometer

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