Dual-modulation CPT differential detection method and system

A detection method and dual modulation technology, applied in the field of precision measurement, can solve the problems of large common-mode noise, low CPT resonance contrast, low common-mode noise, etc., achieve compact structure, improve frequency stability, and realize high-performance chip atomic clock Effect

Active Publication Date: 2021-02-02
NAT TIME SERVICE CENT CHINESE ACAD OF SCI
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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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  • Dual-modulation CPT differential detection method and system

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Embodiment Construction

[0035]The present invention will be further described below in conjunction with the drawings and embodiments. The present invention includes but is not limited to the following embodiments.

[0036]CPT is a kind of quantum interference effect. The application of atomic clocks includes active CPT and passive CPT. Commonly used atoms include Na, K, Rb, Cs, etc., which can be hot atoms, cold atoms, ions, and atomic beams. The working modes include continuous laser action and pulsed laser action, etc. The present invention is based on continuous laser and pulsed laser action.87The specific embodiment of the present invention is described as an example of a bubble-type passive CPT atomic clock in which Rb atoms interact, but the present invention is not limited to this, and the scope of application covers all the above configurations.

[0037]Since the coherent two-color light required for CPT is generated, it can be obtained by locking two lasers with beat frequency, external modulation (such...

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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...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J9/00G01R33/032G04F5/14
CPCG01J9/00G01R33/032G04F5/145H03L7/26
Inventor 云恩学李青林郝强刘国宾高玉平张首刚
Owner NAT TIME SERVICE CENT CHINESE ACAD OF SCI
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