Coherent population trapping atomic clock and realization method thereof

Abstract

The invention provides a coherent population trapping atomic clock and a realization method thereof. The realization method of the coherent population trapping atomic clock comprises the following steps of: filtering an alkali metal gas electrodeless lamp and taking the filtered alkali metal gas electrodeless lamp as a pumping light source for pumping an alkali metal gas atom in a gas chamber, realizing the reverse of the population and then forming alkali metal gas laser under the action of a laser resonant cavity; processing the alkali metal gas laser and carrying out phase locking to obtain dual-frequency laser or carrying out modulation to obtain n-frequency laser; carrying out laser pumping on an alkali metal atomic bubble by adopting the obtained laser; and generating a signal with standard frequency according to a signal generated by carrying out the laser pumping on the alkali metal atomic bubble by the laser. According to the coherent population trapping atomic clock and the realization method thereof disclosed by the invention, the alkali metal laser is used as a laser light source of the CPT (Coherent Population Trapping) atomic clock, the stability of frequency of the alkali metal laser is enhanced and the precision and the reliability of the CPT atom clock are improved. In addition, the service life of the alkali metal gas as a grain medium is long; and even if analkali metal laser works at higher temperature, the service life of the alkali metal laser can also reach twenty years and further the service life of the CPT atom clock is prolonged.

Description

technical field [0001] The invention relates to the technical field of atomic clocks and frequency standards, in particular to a Coherent Population Trapping (CPT for short) atomic clock and an implementation method thereof. Background technique [0002] The CPT atomic clock is based on the narrow linewidth spectrum of the coherent dark state formed by CPT and coherent microwave radiation when two coherent laser beams with a frequency difference equal to the atomic clock transition frequency interact with three-level atoms. [0003] At present, the lasers used in international CPT atomic clocks are semiconductor lasers, especially vertical cavity surface emitting lasers (Vertical Cavity Surface Emitting Lasers, referred to as VCSELs) that can be modulated at high frequencies. Usually, semiconductor lasers or VCSELs have a gain bandwidth of several nanometers. During the long-term operation of atomic clocks, the frequency of semiconductor lasers or VCSELs will drift, thereby ...

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Problems solved by technology

[0004] The invention provides a CPT atomic clock and its implementation method, which are used to improve the accuracy and reliability of the CPT atomic clock in the prior art, and solve the problem of short service life of the CPT atomic clock

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