| Citation: | FANG Zishan, QUAN Wei, ZHAI Yueyanget al. Off-resonance laser frequency stabilization method for fast and accurate adjustment of frequency lock points[J]. Journal of Beijing University of Aeronautics and Astronautics, 2018, 44(8): 1727-1732. doi: 10.13700/j.bh.1001-5965.2017.0644(in Chinese)
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The atomic magnetometer and Raman cooling need to lock the frequency of the laser on the detuning of several gigahertz away from the resonance. The laser frequency stabilization technique in Faraday rotation spectroscopy can stabilize the laser frequency on the large detuning away from the resonance. But, in this method, changing the frequency lock points can be complex and has high latency. We present a far off-resonance laser frequency stabilization method that can fast and accurately adjust the frequency lock points in the range of tens to hundreds of megahertz based on the Faraday rotation spectroscopy. Based on this method, the frequency lock point whose detuning is -6.2 GHz is precisely shifted by 130 MHz, and we obtain a frequency drift of 3.3 MHz/h and a root mean square fluctuation of 0.6 MHz/h. This satisfies the detuning and frequency stability requirements of atomic magnetometer. In this paper, the influence of temperature on the frequency stabilization method is analyzed, the physical constant in the detuning equation is measured to estimate the frequency of the stabilization point, and the temperature regulation and acousto-optic modulator (AOM) regulation are combined to improve the long-term stable and precise control of the laser frequency on the large detuning of off-resonance.
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