Small calcium atom beam optical clock for modulation transfer detection between different wavelengths and preparation method thereof

Abstract

The invention discloses a calcium atom beam optical clock based on modulation transfer detection between different wavelengths and a preparation method thereof, and provides a modulation transfer detection method between different wavelengths applied to thermal atom beams. The phase modulation of the clock laser is performed based on the scheme of thermal atom beam energy level transfer detection,and the modulation transfer signal is detected and modulated by the detection laser with different wavelengths so that the dispersive clock transition modulation transfer spectrum signal with high signal-to-noise ratio and no Doppler background is obtained directly for frequency locking, thus realizing a small calcium atom beam optical clock with high stability. The advantage of high signal-to-noise ratio of the modulation transfer spectrum frequency stabilization technology can be fully exerted, and the small calcium atom beam optical clock has higher frequency stability than the existing small calcium atom beam optical clock and can break through the bottleneck problems of low signal-to-noise ratio of the transition spectrum line and serious Doppler background of the traditional thermalatom optical frequency atomic clock.

Description

technical field [0001] The invention belongs to the technical field of optical frequency atomic clocks and optical frequency quantum frequency standards, and relates to calcium atomic beam optical clock technology, in particular to a small calcium atomic beam optical clock based on modulation transfer detection between different wavelengths and a preparation method thereof. Background technique [0002] With the development of optical frequency atomic clocks, its stability and uncertainty indicators have completely surpassed microwave atomic clocks, and the definition of seconds based on optical frequency atomic clocks has gradually been put on the agenda. Therefore, from the perspective of application, the miniaturization of optical frequency atomic clocks is an important trend in the research and development of optical frequency atomic clocks. Small calcium atomic beam optical clocks have the advantages of small size, portability, high signal-to-noise ratio, and low system ...

AI Technical Summary

Problems solved by technology

However, in such small calcium atom beam optical clocks, the effective utilization rate of the ground state calcium atoms still needs to be improved, and the signal-to-noise ratio of the clock transition line is relatively low, the large Doppler background, the modulation frequency of the clock loop and the Low bandwidth and other problems, and the use of saturated absorption spectrum frequency stabilization technology with low locking accuracy, are not conducive to the improvement of the stability index of the miniaturized calcium atomic beam optical clock

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