Atomic spin precession detecting method and atomic spin precession detecting device based on electro-optic modulation
A technology of atomic spin and electro-optical modulation, which is applied in measuring devices, using magneto-optical equipment for magnetic field measurement, the size/direction of magnetic field, etc. issues such as globalization and integration, to achieve the effects of low modulation voltage, high-sensitivity measurement, and no need for magnetic shielding
Inactive Publication Date: 2016-11-09
BEIHANG UNIV
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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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[0046] Such as figure 1 As shown, a schematic optical path diagram of an atomic spin precession detection method based on electro-optical modulation, including a detection light source 1, a polarizer 2, an atomic sensing module 3, a quarter-wave plate 4, an electro-optic modulator 5, a detection Polarizer 6, photodetector 7. The atomic sensing module 3 includes an optical pumping system 11, an alkali metal gas chamber 12 and a magnetic shielding device 13;
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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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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/032G01C19/58
CPCG01C19/58G01R33/0325
Inventor 丁铭胡焱晖刘学静代玲玲
Owner BEIHANG UNIV
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