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Cesium atom magnetometer

An atomic magnetometer and atomic technology, applied in the direction of the size/direction of the magnetic field, using magneto-optical equipment for magnetic field measurement, etc., can solve the problem of insufficient sensitivity, and achieve the effect of high sensitivity, low cost, and low energy consumption

Inactive Publication Date: 2018-11-30
ZHEJIANG UNIV
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Problems solved by technology

[0009] In order to overcome the problem of insufficient sensitivity of the existing magnetometer, the invention provides a cesium atom magnetometer, which can accurately measure the magnetic field and greatly improve the sensitivity of the magnetic field measurement

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  • Cesium atom magnetometer
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Embodiment Construction

[0026] The present invention will be further elaborated below in conjunction with the accompanying drawings and specific embodiments.

[0027] like figure 1 As shown, a cesium atom magnetometer includes an 894nm semiconductor laser 1, a first polarizing beam splitter 2, a laser frequency stabilization module 3, a mirror 4, a beam expander 5, a half-wave plate 6, and a second polarizing beam splitter 14. Quarter wave plate 7, cesium atom bubble 8, radio frequency field coil 9, magnetic shielding barrel 10, lens 11, photodetector 12 and I phase-locked module 13.

[0028] The assembly relationship between the various components is as follows: the cesium atom bubble 8 is placed in the radio frequency coil 9 and the magnetic shielding barrel 11, the first polarizing beam splitter 2 is placed on the optical path of the laser 1, and the two laser beams generated reach the laser frequency stabilization respectively. Module 3 and reflector 4, beam expander 5, half-wave plate 6, second...

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Abstract

The invention discloses a cesium atom magnetometer comprising a laser, a first polarization beam splitter, a laser frequency stabilization module, a reflecting mirror, a beam expander, a half wave plate, a second polarization beam splitter, a quarter wave plate, a cesium atom bubble, a radio frequency field coil, a magnetic shielding barrel, a lens, a photoelectric detector and a phase-locked module. By applying the self-made 894nm external cavity semiconductor laser, a laser frequency stabilization device and a low-noise magnetic field measurement environment are established, and the double-resonant cesium atom magnetometer based on combination of optical pumping and radio frequency magnetic resonance phases is realized. Through parameter optimization of the magnetometer and closed-loop measurement, the external magnetic field measured by the magnetometer achieves the ultimate sensitivity of 19fT / Hz<1 / 2> and the intrinsic sensitivity of 8.6pT / Hz<1 / 2>, the spatial resolution rate is less than 2cm, and the cesium atom magnetometer is a precision measurement powerful tool for studying of high excited level of atoms and molecules, and has important application value in the aspects ofbiomedicine, geophysics, quantum frequency markers, military detection and the like.

Description

technical field [0001] The invention relates to the technical field of atomic magnetometers, in particular to a cesium atom magnetometer. Background technique [0002] In modern science and technology, magnetic detection technology is widely used, for example, it has very important applications in medicine, military, industry and geophysics, so the detection of magnetic field is a very important technology, and it is often used in the field of magnetic detection A highly sensitive atomic magnetometer is required. [0003] Different application fields determine the technical indicators of magnetic detection equipment. At present, the high-sensitivity magnetometers that have been commercialized mainly include fluxgate magnetometers, proton magnetometers, optical pump magnetometers and superconducting magnetometers. Among them, the superconducting magnetometer is the instrument with the highest magnetic sensitivity currently used, mainly using a superconducting quantum interfe...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/032
CPCG01R33/032
Inventor 黄凯凯李楠陆璇辉
Owner ZHEJIANG UNIV
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