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介绍了一种新的双纵模激光稳频技术:基于激光频率与纵模频率间隔的对应关系,通过精密锁相控制技术将两相邻纵模的拍频频率锁定在射频频率标准上,以控制激光谐振腔腔长,实现锁定激光频率的目的.理论分析表明,激光频率稳定度与两相邻纵模拍频频率的稳定度相同;实验上以射频频率标准为参考,精密锁定了He-Ne激光两相邻纵模的拍频频率及激光频率,且对采用该技术稳频的两套He-Ne激光系统进行了比对.实验结果表明,激光频率的稳定度为5×10-10(1 s积分时间),5×10-11(100 s积分时间).
A new dual longitudinal mode laser frequency stabilization technique is introduced. Based on the correspondence between laser frequency and longitudinal mode frequency spacing, the beat frequency of two adjacent longitudinal modes is locked to the RF frequency standard Control the cavity length of the laser cavity to achieve the purpose of locking the laser frequency.The theoretical analysis shows that the stability of the laser frequency is the same as the stability of the beat frequency of two adjacent longitudinal modes.According to the RF frequency standard, Ne laser two adjacent longitudinal modes of the beat frequency and laser frequency, and the frequency stabilization of the two sets of He-Ne laser system were compared.The experimental results show that the stability of the laser frequency of 5 × 10-10 (1 s integration time), 5 × 10-11 (100 s integration time).