Single-beam mixed light pumping system and background light intensity suppression method thereof

A mixed-light, single-beam technology, applied in the size/direction of the magnetic field, the use of magneto-optical equipment for magnetic field measurement, instruments, etc., can solve the problem of small number of effective atoms, small volume of alkali metal gas chamber, and large polarization Ratio gradient and other issues to achieve the effect of improving sensitivity, reducing influence, and increasing atomic density

Active Publication Date: 2021-05-25
ZHEJIANG LAB
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Problems solved by technology

However, in chip-based single-beam SERF atomic magnetometers, firstly, there is a large polarizability gradient because SERF states require high atomic density; secondly, the sensitivity of single-beam magnetometers is easily affected by laser power fluctuation noise. influence, thereby restricting the further improvement of the sensitivity of the magnetometer; finally, the volume of the alkali metal gas chamber is small, and the number of effective atoms is small, resulting in a decrease in sensitivity

Method used

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  • Single-beam mixed light pumping system and background light intensity suppression method thereof
  • Single-beam mixed light pumping system and background light intensity suppression method thereof
  • Single-beam mixed light pumping system and background light intensity suppression method thereof

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Embodiment Construction

[0025] The present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments, and the purpose and effect of the present invention will become clearer. It should be understood that the specific embodiments described here are only used to explain the present invention and are not intended to limit the present invention.

[0026] Such as figure 1 As shown, the present invention is based on single-beam mixed light pumping system, including pumping laser 1, beam sampler 2, λ / 2 wave plate 3, polarizer 4, fiber coupler 5, total reflection mirror-6, coil 7. Photodetector 1 8. Mixed light pumping atomic gas chamber 9. Photodetector 2 10. Optical filter 11. Thermal insulation cavity 12. Total reflection mirror 2 13. λ / 4 wave plate 14. Lens 1 15. Lens two 16, resistor one 17, resistor two 18, heating laser 19, transimpedance amplifier 20, lock-in amplifier 21.

[0027] Wherein, the pump laser 1, the λ / 2 wave plate 3, the beam sampl...

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Abstract

The invention discloses a single-beam mixed light pumping system and a background light intensity suppression method thereof. The method can greatly improve the atomic density, enhance the signal intensity, and increase the atomic density through the fast spin exchange collision between different alkali metal atoms through a mixed light pumping technology, thereby improving the sensitivity of a magnetometer, reducing the bias of a detection signal at the same time, improving the sensitivity of the atom magnetometer, and having wide application scenes in the biomedical fields such as heart-brain magnetism.

Description

technical field [0001] The invention belongs to the field of magnetic field sensors, in particular to a single-beam mixed light pumping system and a method for suppressing background light intensity. Background technique [0002] As the most sensitive magnetic field detector, the spin-exchange-relaxation-free (SERF) atomic magnetometer has a wide range of applications in magnetic brain detection, brain-computer interface, biomedicine, geological exploration, and detection of fundamental physical quantities. A strong contender for superconducting quantum interferometers (SQUIDs). In particular, chipping the SERF magnetometer is expected to reduce the volume, power consumption, cost, etc. of the SERF magnetometer, which will enable the SERF magnetometer to be widely used. However, in chip-based single-beam SERF atomic magnetometers, firstly, there is a large polarizability gradient because SERF states require high atomic density; secondly, the sensitivity of single-beam magne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/032G01R33/00
CPCG01R33/032G01R33/0029G01R33/0041
Inventor 陈瑶马银涛张宁赵立波于明智陆吉玺
Owner ZHEJIANG LAB
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