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实验研究了电光相位调制中剩余幅度调制以及它的变化引起的碘稳频532 nm光频标的频率漂移。观测了电光晶体温度与剩余幅度调制和光频标锁定后激光频率之间的变化关系。研究了利用主动电压反馈抑制剩余幅度调制的实际效果和存在问题。提出并实现了采用主动温度反馈控制电光晶体温度对剩余幅度调制变化的抑制。实验表明,在主动温度反馈系统闭环后,剩余幅度调制基波成分的抑制程度超过40 dB,同时有效地控制了剩余幅度调制的变化。采用该系统后,没有发现产生附加的激光频率起伏。测量的百秒至万秒取样时间的激光频率稳定度可达到或优于5×10-15,明显地改善了碘稳频532 nm光频标的中长期激光频率稳定度。
The frequency shift of the iodine frequency-stabilized 532 nm optical frequency scale caused by the remaining amplitude modulation in the electro-optical phase modulation and its variation is experimentally studied. The relationship between the optical crystal temperature and the remaining amplitude modulation and the laser frequency after optical frequency locked was observed. The actual effect and existing problems of suppressing residual amplitude modulation by active voltage feedback are studied. Proposed and implemented the use of active temperature feedback control of the optical crystal temperature on the residual amplitude modulation change inhibition. Experiments show that after the closed-loop active temperature feedback system, the residual amplitude modulation fundamental component suppression more than 40 dB, while effectively controlling the remaining amplitude modulation changes. With this system, no additional laser frequency fluctuations were found. The measured laser frequency stability of 100 seconds to 10,000 seconds sampling time can reach or be better than 5 × 10-15, which obviously improves the medium and long-term laser frequency stability of iodine frequency-stabilized 532 nm optical frequency standard.