Laser frequency stabilizing method and optical system for improving performance of optical pumping cesium beam atomic clock

An atomic clock and optical pumping technology, applied to instruments using atomic clocks, etc., can solve the problems of difficult laser power control, pumping light and detection light jump lock, affecting laser detection efficiency, etc., to meet long-term continuous frequency stabilization work. requirements, increase system reliability, and reduce the effect of system complexity
CN110515290AActive Publication Date: 2019-11-29昆山拉姆齐光电科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
昆山拉姆齐光电科技有限公司
Publication Date
2019-11-29

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Abstract

The invention discloses a laser frequency stabilizing method and optical system for improving performance of an optical pumping cesium beam atomic clock. According to the method, a detected fluorescence signal of the optical pumping atomic clock is divided into two paths, one path of fluorescence signal is input into a microwave cavity of the optical pumping atomic clock through a feedback deviation correction loop, and the other path of fluorescence signal is input into the spectrum input end of a laser frequency stabilization module; laser output by a laser device sequentially passes an isolator (1), a delay wave plate (6) and a polarizing beam splitter (7), and is divided into two beams, one beam is used as detection light and enters a light pumping atomic clock detection area, and theother beam is focused by a lens, enters an acousto-optic modulator (9) for frequency shift output and then collimated into parallel light by a lens, and the parallel light is used as pumping light andenters a light pumping atomic clock pumping area. According to the invention, only one AOM device is added, and two sets of complex saturated absorption spectrum light paths and one laser are omitted, so that the system complexity of the whole clock is reduced, the cost is reduced, and the system reliability is improved.
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Description

Technical field

[0001] The invention relates to the field of microwave band frequency standards based on atomic beams, specifically a laser frequency stabilization method and optical system for improving the performance of optically pumped cesium beam atomic clocks. Background technology

[0002] The essence of an atomic clock is to output an extremely stable frequency. The basic principle of an optically pumped cesium beam atomic clock is: in a vacuum magnetically shielded cesium beam tube, cesium atoms are ejected from a high-temperature heated cesium furnace and pass through a collimator. An atomic beam is formed, and the atomic beam passes through the laser pumping area, the microwave action area, and the laser detection area in sequence, and then detects the changes in fluorescence signal intensity in the detection area. Through modulation and demodulation, the deviation information of the atomic clock frequency is obtained, and finally the servo control circuit is used ...

Claims

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