Optical path for suppressing steering difference of laser optical pump magnetometer and design method of optical path
A design method, magnetometer technology
Inactive Publication Date: 2021-03-23
中国船舶重工集团有限公司第七一0研究所
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Problems solved by technology
The steering difference will seriously affect the measurement accuracy of the optical pump magnetometer, as well as the measurement sensitivity on the moving platform
[0005] Therefore, there is an urgent need for a method to suppress the steering difference, which can solve the problem of different values measured by the optical pump magnetometer for the same magnetic field, and ensure the measurement accuracy and sensitivity of the optical pump magnetometer
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[0025] The present invention will be described in detail below with reference to the accompanying drawings and examples.
[0026] The optical path designed by the present invention is specifically as figure 1 As shown, including: VCSEL laser 1, λ / 2 wave plate 2, calcite crystal 3, λ / 4 wave plate 4, 87 Rb atom gas cell 5 , radio frequency coil 6 , first photodetector 7 and second photodetector 8 . where λ is the wavelength of the original linearly polarized laser.
[0027] Such as figure 2 As shown, VCSEL laser 1 is installed on the far left of the optical path, λ / 2 wave plate 2, calcite crystal 3, λ / 4 wave plate 4, 87 The Rb atomic gas cell 5 is sequentially installed on the right side of the VCSEL laser 1 . The radio frequency coil 6 is wound around the 87 Outside the Rb atom gas chamber 5; the first photodetector 7 and the second photodetector 8 are installed vertically and side by side 87 The right side of the Rb atom gas cell 5. In the embodiment of the present inv...
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The invention discloses an optical path for suppressing steering difference of a laser optical pump magnetometer and a design method thereof, and belongs to the technical field of atom magnetometers.A VCSEL laser is adopted to provide a linear polarization laser light source for the laser optical pump magnetometer; two beams of left-handed and right-handed circularly polarized light with the samelight intensity are obtained through an optical assembly of a wave plate and a calcite crystal and two photoelectric detectors, and after the left-handed and right-handed circularly polarized light interacts with atoms, the sum of the light intensities of the two beams of light is obtained through the photoelectric detectors and used for signal processing. Compared with existing Mz and Mx laser optical pump magnetometers adopting single circularly polarized light as a light source, the method can obtain symmetrical magnetic resonance signals through the sum of the magnetic resonance signals generated by the left-handed and right-handed circularly polarized light, and achieves the effects of inhibiting the steering difference of the optical pump magnetometer and improving the measurement precision and sensitivity of the optical pump magnetometer.
Description
technical field [0001] The invention belongs to the technical field of atomic magnetometers, and relates to an optical path and a design method for suppressing the steering difference of a laser optical pump magnetometer. Background technique [0002] Optically pumped magnetometers have the characteristics of high detection sensitivity, and have important applications in military and civilian fields such as magnetic target detection, space physics, biomedicine, and geological exploration. Laser optically pumped magnetometer is a device that uses laser light as a light source to detect the Zeeman effect of atoms in a magnetic field through the interaction between laser and atoms, thereby realizing the perception of external magnetic field strength. The power consumption of the optical pump magnetometer using laser as the light source can be within 1W, and the sensitivity can be better than 5pT / Hz 1 / 2 . [0003] Under an external magnetic field, the Zeeman effect of atoms ma...
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IPC IPC(8): G01R33/032
CPCG01R33/032
Inventor 张樊王羚刘剑刚韩晓东曹平军
Owner 中国船舶重工集团有限公司第七一0研究所