Method and device for realizing CPT atomic frequency standard

Abstract

The embodiments of the invention provide a method and a device for realizing a CPT atomic frequency standard. By a perpendicular intersection of a laser emitted by a first VCSEL through a polarizer and a laser emitted by a second VCSEL through a half-wave plate in a polarization spectroscope, the first VCSEL and the second VCSEL are enabled to generate linearly polarized light coherent polychromatic light, and the linearly polarized light coherent polychromatic light interacts with the atoms in absorption bubbles, so that the output of the CPT atomic frequency standard is realized and the atoms are prevented from being accumulated in a polarization dark state. In addition, the power of a microwave signal coupled on an input current of the each VCSEL is relatively low, so that the total energy of all sidebands of the laser emitted by the each VCSEL is lower than a threshold value, the energy of the laser not participating in the interaction with the atomic is enabled to be relatively low, and interference and noise of a CPT resonance line are reduced. By the method and device, a contrast ratio of the CPT resonance line can be increased, and the stability of the CPT atomic frequency standard is improved.

Description

technical field [0001] The present application relates to the field of atomic frequency standards, in particular to a method and device for realizing CPT atomic frequency standards. Background technique [0002] Atomic frequency standard, referred to as atomic frequency standard, is an important basis for atomic clocks to calculate time. How to quickly and accurately obtain accurate atomic frequency standards has become the focus of attention. Among them, due to the use of coherent population trapping (CoherentPopulationTrapping) CPT to determine the atomic frequency standard equipment, compared with the traditional equipment for determining the atomic frequency standard, there is no resonant cavity, so it has the advantages of small size, low power consumption, and fast start-up, making the CPT atomic frequency standard It has broad application prospects in information communication, measurement and control, terminal navigation and other fields. [0003] In the prior art,...

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Problems solved by technology

[0005] The embodiment of the present application provides a method and device for realizing the CPT atomic frequency standard, which is used to solve the low contrast of the frequency discrimination signal of the CPT atomic frequency standard in the prior art, which leads to a decrease in the accuracy of the CPT atomic frequency standard, and it is difficult to further improve the CPT atomic frequency standard. problem of stability

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