Off-resonance laser frequency stabilization method for fast and accurate adjustment of frequency lock points
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摘要:
原子磁强计、激光冷却等技术需要将激光频率稳定在远离原子跃迁频率几兆赫兹的大失谐处，法拉第旋光光谱稳频方法能够实现远共振线的大失谐处的稳频，但是存在稳频点调节不便的问题。在法拉第旋光光谱稳频方法的基础上进行改进，提出了一种快速精确调节稳频点的远共振线激光稳频方法，能够在几十至几百兆赫兹范围内对稳频点频率进行快速精确的调节。基于该方法使失谐为-6.2 GHz的稳频点精确频移130 MHz，并实现频率漂移3.3 MHz/h，波动均方根值0.6 MHz/h的激光频率稳定度，满足原子磁强计对失谐及频率稳定性的要求。另外，分析了温度对该稳频方法的影响，推导了预估稳频点频率的物理参数，并将温度调节和声光调制器（AOM）调节相结合，以更好地实现在远共振线大失谐处对激光频率的长期稳定和精确控制。
Abstract: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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图 3 使用零级光光谱和一级光光谱分别进行稳频得到的频率漂移
Figure 3. Frequency drift of laser stabilized by zero-order spectrum and first-order light spectrum
图 4 使用一级光光谱稳频点进行稳频的频率漂移
Figure 4. Frequency drift of laser stabilized by first-order light spectrum frequency lock points
图 5 不同温度下Cs的法拉第旋光光谱
Figure 5. Faraday rotation spectra of Cs at different temperatures
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