Laser power stabilization systems with liquid crystal variable retarders have been employed in miniaturized atomic gyroscopes for the merits of low power consumption and easy integration. However, the long-term power drift of the system output with ambient temperature significantly decreases the long-term performance of atomic gyroscopes. Here, we demonstrated a method of dynamic closed-loop control based on the combination of optical power drift and ambient temperature modeling. For a continuous 45 min operation within an ambient temperature variation range of 23.7–25.3 °C, the relative Allan deviation of the output optical power was decreased by one order of magnitude from 2.29 × 10−4 to 3.35 × 10−5 after 100 s averaging time. The long-term stability of the system was significantly improved. In addition, the scheme requires no additional thermal control device, preventing the introduction of extra electromagnetic interference, which is desirable in a miniaturized atomic gyroscope.
Suppression of ambient temperature-caused drift in a laser power stabilization system with a liquid crystal variable retarder in atomic gyroscopes
Yue Niu, Lihong Duan, Jingxin Zhang, Jiong Huang, Yueyang Zhai, Wei Quan; Suppression of ambient temperature-caused drift in a laser power stabilization system with a liquid crystal variable retarder in atomic gyroscopes. Rev. Sci. Instrum. 1 April 2022; 93 (4): 043002. https://doi.org/10.1063/5.0049994
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