Multi-channel pulse pumping atom magnetic force sensing device

Abstract

The invention discloses a multi-channel pulse pumping atom magnetic force sensing device which comprises at least one light splitting polarization-maintaining transmission system, at least one path ofpump light, multi-path detection light, and an atomic magnetic force sensing module. The detection light includes polarized light obtained by light splitting of the light splitting polarization-maintaining transmission system. The atomic magnetic force sensing module is connected with the light-splitting polarization-maintaining transmission system and receives the detection light. The light-splitting polarization-maintaining transmission system includes a depolarization module, a light-splitting module and a polarizing module; the depolarization module and the light-splitting module are connected and arranged in front of the polarizing module. The multi-channel pulse pumping atom magnetic force sensing device has the following advantages: laser is processed by light splitting, depolarization, and then polarizing or is processed by depolarization, light splitting, and then polarizing to divide the laser into needed multi-path laser; with the pumping light entering an atom air chamber,atoms are polarized and thus the atoms generate a relatively large macroscopic magnetic moment, so that a condition that multiple paths of detection light share one atom air chamber to perform multi-point information measurement is met. Therefore, the information measurement efficiency is improved.

Description

Technical field [0001] The invention relates to the field of atomic magnetometers, in particular to a multi-channel pulse pumped atomic magnetic force sensing device. Background technique [0002] Magnetic field information exists in many occasions, and many unknown information can be obtained by using magnetic field information. There are many applications in geomagnetic detection, biomagnetic field detection, etc. Classical magnetic field measuring instruments include fluxgate, Gauss meter and other devices. With the mature development of quantum measurement technology, atomic magnetometers based on quantum effects have appeared, including optical pumping magnetometers, proton magnetometers, spin-exchange relaxation magnetometers, and pulse-pumped magnetometers. The atomic magnetometer has higher sensitivity and accuracy and is the mainstream development direction of current magnetic field measuring instruments. [0003] However, most of the existing atomic magnetometers are si...

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Problems solved by technology

[0003] However, most of the existing atomic magnetometers are single-channel technical schemes, that is, only one channel of detection light is passed through a single atomic gas chamber, and the detection light interacts with atoms to generate signals, and then receives magnetic field information through corresponding photoelectric sensing devices

The single-channel technical solution can only measure the information of a single point in the atomic gas chamber, resulting in low information measurement efficiency

[0004] The main difficulties in realizing a multi-channel atomic magnetic sensor device are: 1. The existing multi-channel technology for a single atomic gas chamber has defects. The distance between adjacent detection lights must be greater than the diffusion length of atoms to ensure the effect of different detection lights. are different atoms, and detect different signals; 2. The multi-channel atomic magnetic sensor device must be equipped with multiple laser beams as the detection light, and the lasers that emit the required lasers are expensive. If multiple lasers are installed, it will greatly increase the cost. Increase the cost of the entire sensing device, which is not conducive to commercial promotion

However, the existing beam splitting methods, such as using beam splitters or optical beam splitters, have the disadvantages of building a relatively complicated splitting system, and requiring precise adjustment of each lens, and the system is easily affected by vibration; there are also beam splitting methods that use The optical fiber splitter splits the light, but since the laser is a coherent light source with good polarization, the polarization of the laser after being split by the optical fiber splitter is poor. The atomic magnetic sensor device requires the detection light to be polarized light, and the optical power are basically the same, therefore, the multi-beam lasers that are only split through the fiber splitter cannot meet the working requirements of the atomic magnetic sensor device

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