US 12,189,005 B1
Optically pumped atomic beam apparatus based on curved four conductors
Shougang Zhang, Xi'an (CN); Fuyu Sun, Xi'an (CN); Chao Li, Xi'an (CN); Xuwen Hu, Xi'an (CN); Jie Liu, Xi'an (CN); and Xiaofeng Li, Xi'an (CN)
Assigned to National Time Service Center, Chinese Academy of Sciences, Xi'an (CN)
Filed by National Time Service Center, Chinese Academy of Sciences, Xi'an (CN)
Filed on Aug. 16, 2024, as Appl. No. 18/806,722.
Claims priority of application No. 202410215751.9 (CN), filed on Feb. 27, 2024.
Int. Cl. G01R 33/26 (2006.01)
CPC G01R 33/26 (2013.01) 6 Claims
OG exemplary drawing
 
1. An optically pumped atomic beam apparatus based on curved four conductors, comprising: a vacuum chamber and the following components disposed in the vacuum chamber:
a beam source device, configured to generate an atomic beam, wherein the atomic beam is perpendicular to and intersects with a pumping laser fed from outside the optically pumped atomic beam apparatus, and achieves state purification of the atomic beam under action of the pumping laser;
a magnetic shielding chamber, configured to shield external environmental magnetic fields;
a curved four-conductor static magnetic field generation structure, configured to generate a static magnetic field under excitation of a working current; wherein the curved four-conductor static magnetic field generation structure comprises curved four conductors with same shapes and sizes; the curved four conductors are symmetrically arranged with the atomic beam as a center axis; a middle portion of each of the curved four conductors is a straight section, and two end portions of each of the curved four conductors are two curved sections bent towards the atomic beam; and each of a plurality of planes perpendicular to the atomic beam intersects with the curved four conductors to form four intersection points, the four intersection points corresponding to each plane form a rectangle with the four intersection points as four vertices of the rectangle to thereby define a plurality of rectangles corresponding to the plurality of planes, and a length-width ratio of each rectangle of the plurality of rectangles is the same;
a microwave cavity, configured to generate a microwave field under excitation of an external microwave signal, wherein the microwave field is configured to excite the atomic beam to perform magnetic resonance transition; and
a fluorescence collection device, configured to collect fluorescence photons to extract a magnetic resonance transition signal for the magnetic resonance transition, wherein the atomic beam undergoing the magnetic resonance transition perpendicularly intersects with a detection laser fed from outside the optically pumped atomic beam apparatus, and the fluorescence photons are generated under the action of the detection laser.