US 11,867,778 B2
System and method for testing spatial distribution uniformity of alkali metal atom number density of atom magnetometer
Qiang Guo, Hangzhou (CN); Ning Zhang, Hangzhou (CN); Ziwen Li, Hangzhou (CN); Zixuan Wang, Hangzhou (CN); Mengshi Zhang, Hangzhou (CN); and Tingting Yu, Hangzhou (CN)
Assigned to ZHEJIANG LAB, Hangzhou (CN)
Filed by ZHEJIANG LAB, Hangzhou (CN)
Filed on Aug. 17, 2022, as Appl. No. 17/889,802.
Application 17/889,802 is a continuation of application No. PCT/CN2022/101105, filed on Jun. 24, 2022.
Claims priority of application No. 202111071312.8 (CN), filed on Sep. 14, 2021.
Prior Publication US 2023/0092597 A1, Mar. 23, 2023
Int. Cl. G01R 33/032 (2006.01)
CPC G01R 33/032 (2013.01) 6 Claims
OG exemplary drawing
 
1. A system for testing the spatial distribution uniformity of an alkali metal atom number density of an atom magnetometer, comprising: a detection light laser, a laser beam expander, a polarizer, a diaphragm, a beam splitting prism, an alkali metal atom gas chamber, and a first beam profile camera, which are sequentially arranged in a detection light advancing direction, wherein the alkali metal atom gas chamber is sequentially coated from inside to outside with an oven, a vacuum cavity, a magnetic compensation coil, and a magnetic shielding system; a laser wavelength generated by the detection light laser is a D1/D2 line of an alkali metal atom used;
after passing through the laser beam expander, the polarizer, the diaphragm, and the beam splitting prism, laser light output by the detection light laser is split into two beams of refracted light of the same power and shape by the beam splitting prism, one beam of refracted light enters a second beam profile camera to measure a light intensity distribution matrix I(0) of incident light, the other beam of refracted light is received by the first beam profile camera after passing through the alkali metal atom gas chamber and the oven, the vacuum cavity, the magnetic compensation coil and the magnetic shielding system outside the alkali metal atom gas chamber to measure a light intensity matrix I(l) of emergent light, and a matrix of an atom number density n on a pixel lattice is calculated by using the following formula:

OG Complex Work Unit Math
in the above formula: re is a classical atom radius, c is a speed of light, f is a resonance intensity, ΓL is pressure broadening, and l is a travel of light in the gas chamber;
n is written in a matrix form

OG Complex Work Unit Math
the distribution uniformity of is analyzed by using a discrete coefficient method, and a calculation formula is as follows:

OG Complex Work Unit Math
σ is a variance of the matrix n, and X is an average value of all elements of the matrix n.