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建立了两套可搬运型碘分子稳频的532 nm固体激光频标装置,其中一套采用了自行研制的半非平面单块固体环形激光器作为光源,在该激光器中采用密封隔离罩消除了气压抖动造成的影响。在两套装置中,利用折叠光路实现了4倍碘室长度的1.8 m的实际光学吸收程,大大提高了误差信号的信噪比。设计并建立了主动温度反馈控制系统,有效抑制了电光相位调制器中剩余幅度调制的变化。两套系统频率同时锁定在碘分子的超精细谱线R(56)32-0的a10分量上。连续不间断15×104s的拍频测量结果表明:1 s采样时间的激光频率稳定度的Allan方差优于2.4×10-14,大于200 s采样时间的激光频率稳定度的最小Allan方差典型值可达到4×10-15。
Two sets of 532 nm solid-state laser frequency-standard devices with iodine molecule frequency stability were established. One set of self-developed semi-non-planar monolithic solid ring lasers was used as the light source. The sealed isolators were used to eliminate the pressure The impact of jitter. In both sets of devices, the actual optical absorption of 1.8 m with a length of 4 times the length of the iodine chamber was achieved by folding the optical path, greatly improving the signal-to-noise ratio of the error signal. The active temperature feedback control system is designed and established, which effectively suppresses the variation of the remaining amplitude modulation in the electro-optic phase modulator. The two system frequencies are simultaneously locked to the a10 component of the hyperfine line R (56) 32-0 of the iodine molecule. The continuous measurement of 15 × 104s beat frequency shows that the Allan variance of the laser frequency stability at 1 s sampling time is better than 2.4 × 10-14 and the minimum Allan variance of the laser frequency stability at the sampling time greater than 200 s is Reached 4 × 10-15.