Optical rotation detection method based on acousto-optic modulation in an atomic spin co-magnetometer
| Autor: | Yang Fu, Li Xing, Qingzhong Cai, Feng Liu, Wei Quan, Tianxiao Song, Yueyang Zhai |
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| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Measurement Science and Technology. 32:025112 |
| ISSN: | 1361-6501 0957-0233 |
| Popis: | A new concept for probe light intensity stability control and high-frequency modulation based on an acousto-optic modulation in a K-Rb-21Ne 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. |
| Databáze: | OpenAIRE |
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