CPT atomic clock optical structure
An atomic clock and optical path technology, applied in the field of CPT atomic clocks, can solve the problems of small signal contrast and short effective time of the optical path, and achieve the effects of improving signal contrast, increasing operating optical path, and improving stability
Active Publication Date: 2017-05-10
LANZHOU INST OF PHYSICS CHINESE ACADEMY OF SPACE TECH
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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
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[0020] In the prior art, only one cavity in the double-cavity atomic gas chamber is used as the optical action cavity, which results in short effective action time of the optical path and low signal contrast. But in fact, the saturated vapor pressure of alkali metal and the pressure of buffer gas in the two chambers of the double-cavity atomic gas chamber are basically the same. Although there are impurities in the reaction chamber, their content has little effect on the optical path, so it can be used as the second chamber. .
[0021] Therefore, if figure 1 As shown, the present invention increases the total reflection mirror structure on the reaction cavity and the optical action cavity top of the double-cavity atomic gas chamber 15, including the first reflector 6a and the second reflector 6b, as figure 1 As shown, the laser light emitted by the VCSEL laser (vertical cavity surface emitting laser) 1 first enters the optical action cavity of the double-cavity atomic gas cha...
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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...
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Login to View More IPC IPC(8): G04F5/14
CPCG04F5/14
Inventor 廉吉庆陈大勇涂建辉张金海陈溶波缪培贤王剑祥杨世宇杨炜崔敬忠
Owner LANZHOU INST OF PHYSICS CHINESE ACADEMY OF SPACE TECH