Application and Performance Improvement of an Optical Power Stabilization System Based on MEMS-LCVR in a SERF Atomic Magnetometer

Application and Performance Improvement of an Optical Power Stabilization System Based on MEMS-LCVR in a SERF Atomic Magnetometer

A stabilization method utilizing MEMS technology combined with a liquid crystal variable retarder (LCVR) was developed to enhance fiber laser output power stability and was applied to a spin-exchange relaxation-free (SERF) atomic magnetometer. Comparative experiments demonstrated that the unstabiliz...

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Bibliographic Details
Main Authors: Yitong Li, Wenfei Zhang, Jianqi Yang, Ying Liu, Yueyang Zhai
Format: Article
Language:English
Published: MDPI AG 2025-06-01
Series:Photonics
Subjects:
MEMS technology
liquid crystal variable retarder
power stability
spin-exchange re-laxation-free atomic magnetometer
optical noise reduction
magnetometry sensitivity
Online Access:https://www.mdpi.com/2304-6732/12/6/573
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Summary:A stabilization method utilizing MEMS technology combined with a liquid crystal variable retarder (LCVR) was developed to enhance fiber laser output power stability and was applied to a spin-exchange relaxation-free (SERF) atomic magnetometer. Comparative experiments demonstrated that the unstabilized laser output exhibited <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>2.8</mn><mo>%</mo></mrow></semantics></math></inline-formula> power fluctuations over a 500 s period, while the stabilized laser reduced this to <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>0.2</mn><mo>%</mo></mrow></semantics></math></inline-formula>. Spectral density analysis confirmed suppressed frequency-domain fluctuations, indicating improved robustness against disturbances. Furthermore, the stabilized laser also reduced optical noise in SERF magnetometry, achieving a sensitivity of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>19.2</mn><mspace width="3.33333pt"></mspace><mi>fT</mi><mo>/</mo><msup><mi>Hz</mi><mrow><mn>1</mn><mo>/</mo><mn>2</mn></mrow></msup></mrow></semantics></math></inline-formula>. These results validate that the method optimizes both time- and frequency-domain performance, thereby advancing high-precision SERF magnetometry.
ISSN:2304-6732

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