Optical rotation detection method based on acousto-optic modulation in an atomic spin co-magnetometer. (3rd December 2020)

• Record Type: Journal Article
• Authors: Xing, Li; Zhai, Yueyang; Fu, Yang; Song, Tianxiao; Liu, Feng; Cai, Qingzhong; Quan, Wei
• Is Part Of: Measurement science & technology. Volume 32:Number 2(2021)
• Publication Date: 2020-12-03
• Subjects: acousto-optic modulation -- K-Rb-21Ne co-magnetometer -- light intensity stability -- high-frequency modulation; Physical measurements -- Periodicals; Scientific apparatus and instruments -- Periodicals; Equipment and Supplies -- Periodicals; Science -- instrumentation -- Periodicals; Technology -- instrumentation -- Periodicals; Mesures physiques -- Périodiques; Physical measurements; Scientific apparatus and instruments; Periodicals; 502.87
• DOI: 10.1088/1361-6501/abbc8a
• Languages: English
• ISSNs: 0957-0233

Abstract

Abstract: A new concept for probe light intensity stability control and high-frequency modulation based on an acousto-optic modulation in a K-Rb- 21 Ne co-magnetometer is reported. The structure and optical path are ingeniously designed to avoid the interference of zero-order diffraction light. The average rotation rate sensitivity of 7 .9 × 1 0 - 7 rad s − 1 Hz − 1 / 2 is achieved under the light intensity closed-loop control condition and the bias instability calculated by the Allan deviation is improved from 0.13 deg h −1 to 0.06 deg h −1 comparing with open-loop scheme. A square wave modulation with a wide range of frequencies is applied to the probe light intensity and the appropriate modulation frequency for the co-magnetometer is tested to be 10 kHz to 300 kHz and megahertz scale. Finally, the closed-loop control of light intensity has been combined with the high-frequency modulation, which could suppress the low-frequency noise contained in the probe system and improve the long-term stability of the angular velocity measurement.