CPT (Coherent Population Trapping) atomic clock

Abstract

The invention relates to a CPT (Coherent Population Trapping) atomic clock which comprises a first physical unit, a second physical unit and a third physical unit, wherein the first physical unit comprises a laser, a flat convex mirror and a quarter wave plate; the second physical unit comprises a Polaroid set; the third physical unit comprises an Rb bubble air chamber and a photoelectric detector; the laser outputs round polarized light through the flat convex mirror and the quarter wave plate; and the round polarized light sequentially passes through the Polaroid set and the Rb bubble air chamber to the photoelectric detector. In the invention, the first physical unit, the second physical unit and the third physical unit have the advantages of compact and firm structure, convenience of debugging and strong adaptability and are particularly in an integrated design of a magnetic shielding device. The invention realizes the optimization design of the physical units with a miniaturization requirement under the condition of low micromachining process at present and has the advantages of low cost, high stability, convenience of debugging, small size and low power consumption.

Description

technical field [0001] The present invention relates to a CPT atomic clock. Background technique [0002] The research on atomic clocks mainly focuses on two aspects: one is to explore the development of atomic clocks with higher accuracy and stability. In recent years, many different types of new atomic clocks with higher accuracy and stability have been successfully developed. For example, cold atomic fountain clocks, ion trap clocks, optical clocks, etc.; on the other hand, it is actively looking for ways to achieve high-precision small-scale engineering atomic clocks to meet the development needs of various engineering technologies, such as the development of small space-borne atomic clocks, the use of coherent atomic clocks The principle of population trapping develops a miniaturized coherent population trapping atomic clock. [0003] Coherent Population Trapping (CPT, Coherent Population Trapping) is a quantum interference phenomenon produced by the interaction betwee...

AI Technical Summary

Problems solved by technology

[0004] In practice, the general CPT desktop experiment system only pursues the convenience of commissioning, and does not consider the size and power consumption. However, the miniature or even chip-level CPT atomic clocks really pay attention to the reduction of volume and power consumption, but it is not convenient for commissioning.

The indicators of the CPT atomic clocks realized so far are not very high, mainly in the serious temperature drift phenomenon, high power consumption caused by temperature control, and the stability of the output signal of the atomic frequency standard is low.

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