A cpt atomic clock optical path structure

Abstract

The invention discloses a CPT atomic clock optical structure. Lasers emitted through a VCSEL laser device pass through an optical isolator and a 1 / 4 wave plate in sequence and enter an optical interaction cavity of a double-cavity MEMS atomic vapor chamber to react with alkali metal the first time; emitted lasers from the optical interaction cavity of the double-cavity MEMS atomic vapor chamber enter a reaction chamber of the double-cavity MEMS atomic vapor chamber to react with the alkali metal in the reaction chamber the second time after experiencing two total reflections of a first reflector and a second reflector, and then enter a photoelectric detector. The CPT atomic clock optical structure is improved based on the traditional optical structure of the double-cavity atomic vapor chamber, the interaction optical path is increased, the laser contrast of the photoelectric detector is improved, and the problem that laser outputting power stability of the laser device is influenced because reflective lasers irradiate the laser device is avoided.

Description

technical field [0001] The invention belongs to the technical field of CPT (coherent layout trapping) atomic clocks, in particular to a CPT atomic clock optical path structure, which can be used for the preparation of the CPT atomic clock optical path structure. Background technique [0002] Because the physical part of CPT atomic clock does not need microwave cavity, it can realize miniaturization or even chip design, which is a research hotspot in the field of atomic clock at present. The most important technical difficulty that needs to be overcome in the miniaturization and chipping of CPT atomic clocks is to realize the fabrication of micro-optical path structures by using micro-electromechanical systems (MEMS) technology and micro-bonding technology. At present, the mainstream method for the preparation of MEMS atomic gas chambers is to use the barium azide replacement method, and the atomic gas chambers are designed as a double-cavity structure, one of which is a reac...

AI Technical Summary

Problems solved by technology

Using barium azide replacement method will leave some BaCl in the reaction chamber 2 Therefore, when designing the optical path structure, the optical path using this type of atomic gas chamber only uses another cavity as the optical path effect cavity, but the effective action time of the optical path is short and the signal contrast is small

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