Laser excitation stability control device and method for diamond nitrogen vacancy color center thermometer

By using liquid crystal phase retarder and acousto-optical modulation technology in a diamond NV color center thermometer, the impact of laser power fluctuations on temperature measurement is solved, and the measurement stability and accuracy are significantly improved.

CN119714588AActive Publication Date: 2025-03-28NATIONAL INSTITUTE OF METROLOGY CHINA
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Patent Information

Application Number
CN202411907228.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-24
Publication Date
2025-03-28
Estimated Expiration
2044-12-24

AI Technical Summary

Technical Problem

The power fluctuations of existing diamond NV color-center thermometers during laser excitation lead to increased ODMR spectrum noise, reduced temperature measurement accuracy, and limited inhibition effect, accompanied by fluctuations in the heating effect caused by laser.

Method used

The light intensity stable closed-loop control design based on the liquid crystal phase retarder is adopted, and the excitation laser optical path based on the acousto-optical modulation is integrated to realize the power stable closed-loop control of the full laser optical path of the diamond NV color-center thermometer, and suppress the influence of laser fluctuations from the source.

Benefits of technology

It significantly improves the long-term stability of the diamond NV color-center thermometer and the anti-interference ability of the optical path, effectively suppresses laser power fluctuations and heating effect fluctuations caused by ambient temperature changes, and achieves long-term and stable fluorescence output and temperature, magnetic field and other measurements.

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Abstract

The invention discloses a laser excitation stability control device and method for a diamond nitrogen vacancy color center thermometer, and the device comprises an excitation laser, a laser stabilization closed-loop control module, an acousto-optic modulation module, and a fluorescence collection module. The method is fused with an excitation laser light path based on acousto-optic modulation, and full-laser light path power stable closed-loop control of the diamond NV color center thermometer is achieved. The long-term stability of the diamond NV color center thermometer and the anti-interference capability of a light path can be obviously improved, laser power fluctuation caused by changes of environment temperature and the like and heating effect fluctuation caused by the laser power fluctuation are effectively inhibited, long-term stable fluorescence output and measurement of temperature, magnetic field and the like are realized, and the method is suitable for large-scale popularization and application. Therefore, the application of the diamond NV color center thermometer in the fields of power systems, chip manufacturing and the like is facilitated.
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