Left-hand and right-hand circular polarized light (CPT) atomic clock physical system device

Abstract

A left-hand and right-hand circular polarized light (CPT) atomic clock physical system device comprises a laser beam emission device, a lens, an attenuator, a polaroid, a first lambda / 4 wave plate, abubble, a second lambda / 4 wave plate, a zero-degree partially reflecting mirror and a photoelectric detector; a linearly-polarized circular divergent laser beam emitted from the laser beam emission device is converted into a linearly-polarized parallel beam through the lens, a first linearly-polarized parallel beam is acquired through the polaroid, and is converted into a second linearly-polarizedparallel beam through the first lambda / 4 wave plate, the bubble and the second lambda / 4 wave plate; through the zero-degree partially reflecting mirror, a part of the second linearly-polarized parallel beam is reflected to pass through the second lambda / 4 wave plate, the bubble and the first lambda / wave plate to obtain a second reflected linearly-polarized parallel beam which is further injectedto a vertical cavity surface laser emitter, and the other part of the second linearly-polarized parallel beam is output to the photoelectric detector. According to the device, atoms are concentrated at the 0-0 energy level, so that CPT resonance signals are enhanced, signal to noise ratio and contrast ratio of the signals are increased. All members of the device are easy to be integrated, which realizes miniaturization of the passive CPT atomic clock.

Description

technical field [0001] The invention relates to the technical field of atomic clocks, in particular to a CPT atomic clock physical system device for left and right circularly polarized light, which is suitable for small passive CPT atomic clocks. Background technique [0002] Atomic clock is a measuring instrument that can provide precise time, and bubble atomic clock is widely used in global positioning system, communication, military and other aspects. The physical system in the atomic clock is the core component of the atomic clock and the key technology for the level of atomic clocks in various countries. The core device of the physical system is the atomic bubble. The bubble contains alkali metal atoms and buffer gas. The alkali metal atoms are rubidium-87 or rubidium-85 and cesium-133. The buffer gas is nitrogen, methane and other gases, which are used to compress the narrow line. degree, fluorescence quenching, etc. Such as figure 1 As shown, under a weak magnetic ...

AI Technical Summary

Problems solved by technology

However, the short-term frequency stability of atomic clocks (called frequency stability in the professional field, actually refers to frequency instability) is inversely proportional to the contrast, so the short-term stability of atomic clocks manufactured by this scheme is not high

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