Method and device for realizing CPT atomic frequency standard

An atomic frequency and standard technology, applied in the automatic control of power, electrical components, etc., can solve the problems that it is difficult to further improve the stability of the CPT atomic frequency standard, the contrast of the frequency discrimination signal is low, and the accuracy of the CPT atomic frequency standard is reduced.

Active Publication Date: 2016-05-11
BEIJING INST OF RADIO METROLOGY & MEASUREMENT
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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 a

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  • Method and device for realizing CPT atomic frequency standard
  • Method and device for realizing CPT atomic frequency standard
  • Method and device for realizing CPT atomic frequency standard

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Embodiment Construction

[0022] In this application, two VCSELs are used to emit lasers with different frequencies, and the lasers are linearly polarized coherent polychromatic light. Through the interaction between the two lasers with different frequencies and the atoms in the absorption bubble, the output of the CPT atomic frequency standard is realized. And, the microwave signals coupled on these two VCSELs make the frequencies of the sidebands of the two VCSELs emit laser light as a reference for adjusting the frequency of the two VCSELs to emit laser light, so that the adjusted frequency of the two VCSELs emitted laser light is more accurate. Accurate, higher contrast of CPT resonance lines. Through the method provided by this application, the atoms in the absorbing bubble can be avoided from accumulating in the polarized dark state, and the contrast of the CPT resonance line after long-term use can be stabilized, and the ± in the VCSEL emission laser is no longer involved in the atomic interactio...

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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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Application Information

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IPC IPC(8): H03L7/26
CPCH03L7/26
Inventor 张振伟杨仁福张旭王暖让赵环陈星
Owner BEIJING INST OF RADIO METROLOGY & MEASUREMENT
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