Final state detection device and detection method for atom interferometer

By introducing an optical resonant cavity into the atom interferometer and using laser absorption detection, the detection laser is allowed to interact with the atomic cluster multiple times, which solves the problem of low measurement accuracy of final-state atomic population information in the existing technology and achieves higher measurement accuracy and signal strength.

CN119915745BActive Publication Date: 2025-09-30CENT CHINA OPTOELECTRONICS TECH RES INST (CHINA STATE SHIPBUILDING CORP 717TH RES INST)
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Patent Information

Application Number
CN202411940461.7
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-12-26
Publication Date
2025-09-30
Estimated Expiration
2044-12-26

AI Technical Summary

Technical Problem

In the existing technology, the final-state atomic population information measurement accuracy of the atom interferometer is low, the fluorescence detection method is inefficient and has weak signal strength, and the absorption detection method has strong resistance to stray light but the signal is still weak.

Method used

Laser absorption detection is adopted, and an optical resonant cavity is introduced to make the detection laser interact with the atomic group to be measured multiple times. The atomic final state population information is calculated by detecting the transmitted light power of the laser under different test states.

Benefits of technology

The measurement accuracy of the final-state atomic population information of the atom interferometer is improved, the influence of stray light is overcome, and the intensity of the absorption signal is enhanced.

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Abstract

The present application relates to a final state detection device and detection method for an atom interferometer. The device includes a detection laser collimator, a first coupling lens, a resonant cavity, a second coupling lens, a photodetector, and a computing terminal. The resonant cavity includes a first cavity mirror and a second cavity mirror located on opposite sides of a vacuum cavity of the atom interferometer. The vacuum cavity contains a group of atoms to be measured in different test states. In each test state, the detection laser collimator is used to output a detection laser and enter the vacuum cavity through the first coupling lens and the first cavity mirror. The detection laser passes through the group of atoms to be measured multiple times and is coupled to the photodetector through the second cavity mirror and the second coupling lens. The computing terminal obtains the transmitted light power of the detection laser in each test state through the photodetector to determine the atomic final state population information after atomic interference. The detection laser resonates with the transition spectrum line of the atomic group to be measured. The present application can improve the measurement accuracy of the final state atomic population information.
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