Atomic clock reference frequency obtaining method and atomic clock

Abstract

The invention discloses an obtaining method of atomic clock reference frequency and atomic clock thereof. The method includes the following steps: a semiconductor laser is driven by a drive current source, and the semiconductor laser is modulated by microwave signals simultaneously; two pumping lasers with same frequency difference and modulating frequency of microwave signals can be generated; the two pumping lasers act on atoms having an Lambda three-level system; when the frequency of microwave signals has deviation with the interval of two lower levels of the Lambda three-level system of the atoms and when the frequency deviation is bigger than spectral half width of coherent population tripping (CPT), a relaxation oscillator signal with the same frequency as CPT detuning transient oscillation is generated; and the frequency of the relaxation oscillator signal is added with the modulating frequency of the microwave signals so as to obtain standard frequency of an atomic clock. The atomic clock designed according to the method has simple structure and omits a locking circuit of the traditional atomic clock, thereby improving the adaptability for the external environment.

Description

technical field [0001] The invention relates to a design method of an atomic clock, in particular to a method for acquiring the reference frequency of the atomic clock and the atomic clock. Background technique [0002] The principle of the traditional atomic clock is to detect the reference spectral line of the atomic energy level, and lock the output frequency of the atomic clock with the reference spectral line, so as to obtain a stable atomic clock frequency. Specifically, a microwave signal or an optical frequency signal is combined with a microwave signal or an optical frequency signal using a phase-locked circuit or similar technology based on the frequency spectrum line absorbed or emitted by the transition of a certain energy level of the atom (because it has relatively high stability). The center locking of a transition frequency, so as to obtain a frequency output that is close to the atomic transition frequency, as the reference frequency of the atomic clock, and...

AI Technical Summary

Problems solved by technology

Therefore, the important part of the traditional atomic clock is the locking of the output frequency and the reference spectral line. The locking circuit has high requirements and is prone to unstable factors.

Images