Device and method for achieving Ramsey-CPT atomic clock through microwave frequency switching

Abstract

The invention discloses a method and device for achieving a Ramsey-CPT atomic clock through microwave frequency switching. The method for achieving the Ramsey-CPT atomic clock through microwave frequency switching comprises the steps that (A) currents and microwaves are coupled to a laser tube so that the laser tube can output multi-color coherent laser light; (B) the frequency distribution of the multi-color coherent laser light is changed by periodical microwave frequency switching, an atom in the CPT state is prepared when the frequency distribution meets the requirements of CPT resonance, no action exists between the laser light and the atom under the detuning condition, and Ramsey-CPT interference is conducted by the existing CPT atom and a laser field when resonance occurs again; (C) the Ramsey-CPT atomic clock is achieved by using Ramsey-CPT interference fringes as microwave frequency discrimination signals. According to the method and device for achieving the Ramsey-CPT atomic clock through microwave frequency switching, due to the facts that the frequency of microwaves of an input laser device is changed periodically and the power is kept constant, the problem that according to a periodical microwave on-off scheme, due to the fact that the power of the input laser device can be changed suddenly, the frequency of output laser light fluctuates is solved. As a result, the obtained atomic clock has more excellent performance. By the adoption of the method and device for achieving the Ramsey-CPT atomic clock through microwave frequency switching, small and minitype atom clocks can be achieved.

Description

technical field [0001] The invention relates to the field of atomic clocks, in particular to a device for switching microwave frequencies to realize a Ramsey-CPT atomic clock, and also relates to a method for switching microwave frequencies to realize a Ramsey-CPT atomic clock. Suitable for the manufacture of small and miniature atomic clocks. Background technique [0002] Passive CPT atomic clocks have been widely studied due to their miniaturization advantages, and there are commercially available miniature CPT atomic clocks. Passive CPT atomic clocks usually inject a microwave-modulated current into a vertical-cavity surface-emitting laser (VCSEL) to generate coherent dichromatic light that interacts with the three-level system of atoms. When the frequency of the two incident light fields is equal to the transition frequency of the atom, and the frequency difference is equal to When the frequency difference between the two hyperfine energy levels of the ground state of t...

AI Technical Summary

Problems solved by technology

However, the optical system of the currently implemented Ramsey-CPT atomic clock scheme is too large to be converted into a practical atomic clock product.

Although there has been a small and practical Ramsey-CPT atomic clock scheme realized by periodic microwave on-off, the microwave on-off causes the microwave power input to the VCSEL to change drastically at the moment of on-off, causing the output laser wavelength of the VCSEL to oscillate for a long time during the on-off process. Reduced laser quality and thus performance of the realized atomic clock

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