Dual-modulation CPT differential detection method and system

Abstract

The invention provides a double-modulation CPT differential detection method and system, and the method comprises the steps that: left-handed and right-handed polarization and phase synchronous modulation coherent double-color light are firstly generated, the left-handed and right-handed polarization and phase synchronous modulation coherent double-color light interact with a quantum resonance system, and the quantum system is in a CPT state; through polarization and phase difference time sequence design and control, linearly polarized double-color light interacts with a quantum system prepared to be in a CPT state, left-handed and right-handed polarization components of the linearly polarized double-color light respectively generate CPT with long interference and CPT with destructive interference, then transmitted light is subjected to space separation through polarization conversion and a beam splitter and is respectively detected by a photoelectric detector, and differential CPT signals are obtained. The detection system is compact in structure, high in detection contrast and low in common-mode noise.

Description

Technical field[0001]The invention belongs to the technical fields of precision measurement such as atomic clocks, atomic magnetometers, atomic spectroscopy, etc., and specifically relates to a CPT differential detection technology.Background technique[0002]Coherent population trapping (CPT) is a kind of quantum interference effect. The atomic sensor device based on the passive CPT configuration has been used to realize miniaturization or even miniaturization of atomic clocks, atomic magnetometers, etc. due to the feature that it does not require a microwave cavity. It is used for deep space exploration, drones, urban and underground rescue It is an ideal choice for applications such as underwater submarine and surveying. It is also the core component of the micro-autonomous positioning and navigation punctuality (μPNT) system.[0003]Take the passive CPT atomic clock as an example. The current passive CPT atomic clock (hereinafter referred to as CPT clock) usually uses a single circu...

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the shortcomings of low CPT resonance contrast and high common-mode noise in the prior art, the present invention provides a dual-modulation CPT differential detection method. The detection system has a compact structure, high detection contrast and low common-mode noise.

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