A device and method for switching microwave frequency to realize ramsey-cpt atomic clock

Abstract

The invention discloses a method and device for realizing Ramsey-CPT atomic clock by switching microwave frequency. The method includes A. coupling current and microwave to a laser tube to output multicolor coherent laser; B. periodically switching microwave frequency to change multicolor laser Frequency distribution, when the frequency distribution satisfies the CPT resonance, CPT state atoms are prepared. When detuning, the laser and the atoms have no effect. When resonating, the existing CPT atoms and the laser field perform Ramsey-CPT interference; C. Use Ramsey-CPT interference fringes as Microwave frequency discrimination signal realizes atomic clock. In the present invention, the microwave frequency of the input laser changes periodically while the power remains unchanged, which overcomes the problem that the output laser frequency fluctuates due to the sudden change of the input laser power caused by the periodic on-off microwave scheme. Therefore, the obtained atomic clock has better performance. The application of this scheme can realize small and micro atomic clocks.

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

Images