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在采用磁光阱实现单个铯原子俘获的实验中,运用无调制偏振光谱方法将光栅外腔半导体激光器(提供冷却/俘获光)的频率锁定在铯原子6S_(//2)F=4→6P_(3/2)F′=5的超精细跃迁线上。采用偏振光潜技术得到的类色散曲线作为鉴频信号,并同时对光栅外腔半导体激光器的电流调制端口和光栅外腔的压电陶瓷电压调制端口进行反馈,以拓展反馈环路的带宽,实现激光器的频率锁定。与通常的饱和吸收光谱稳频技术相比,激光频率锁定之后的频率稳定度得到了明显改善。在取样时间τ=300 s时,阿仑方差σ_y(τ)=4.6×10~(-12)。
In the experiment of using magneto-optical trap to capture a single cesium atom, the frequency of the grating external cavity semiconductor laser (providing cooling / capturing light) was locked by a modulation-free polarization spectroscopy in the cesium atom 6S_ (// 2) F = 4 → 6P_ (3/2) F ’= 5 hyperfine transition line. The dispersion-like curve obtained by the polarization submarine technique is used as the frequency-discriminating signal, and the current modulation port of the grating external cavity semiconductor laser and the piezoelectric ceramic voltage modulation port of the grating external cavity are fed back at the same time to expand the bandwidth of the feedback loop Laser frequency lock. Compared with the conventional saturation absorption spectrum stabilization technique, the frequency stability after laser frequency locking has been significantly improved. At sampling time τ = 300 s, the variance of σ ~ y (τ) is 4.6 × 10 ~ (-12).