Analysis of effect of pump light wavelength on the magnetic noise suppression of the SERF co-magnetometer

• Published in: Sensors and actuators. A. Physical. Vol. 374; p. 115471
• Main Authors: Yuan, Qi, Fan, Wenfeng, Wang, Zhuo, Pang, Haoying, Fan, Shimiao, Li, Xiaoping, Liu, Feng, Quan, Wei
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 16.08.2024
• Subjects: Detuning of the wavelength; Magnetic noise; Optical pumping; Polarization gradient; SERF co-magnetometer; Magnetic noise; Optical pumping; Detuning of the wavelength; SERF co-magnetometer; Polarization gradient
• ISSN: 0924-4247
• DOI: 10.1016/j.sna.2024.115471

Spin Exchange Relaxation-Free Co-Magnetometer (SERFCM) possesses ultra-sensitive rotation measurement capabilities, offering broad application prospects in inertial navigation and fundamental physics research. Precision of SERFCM in rotation measurements is directly influenced by its ability to suppress magnetic noise. In this study, a state-space method is used to establish a SERFCM response model, considering the effect of pump light wavelength. An analysis is conducted to assess the effect of pump light wavelength detuning on the ability to suppress magnetic noise of SERFCM. Theoretical results indicate that detuned pump light wavelength can effectively reduce the magnetic field gradient generated by atomic polarization, thereby improving overall system performance. Experimental validation demonstrates that a slight detuning of the pump light wavelength results in a 21% improvement in the ability to suppress low-frequency magnetic fields. [Display omitted] •Establish a SERFCM response model considering the effect of pump light wavelength.•Effect of pump light wavelength on magnetic field gradient is analyzed and proved.•The low-frequency magnetic field suppression ability improves by 21%.