光栅外腔半导体激光器的无调制偏振光谱稳频及其在单原子磁光阱中的应用
Frequency stabilization of grating-external-cavity diode laser by modulation-free polarization spectroscopy and its application in single atoms magneto-optical trap
基于磁光阱俘获单个铯原子的实验，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6S1/2 Fg = 4 → 6P3/2 Fe = 5的循环跃迁线上。用偏振光谱输出的色散曲线来提供锁频回路中所用到的鉴频信号，并对激光器的电流调制端口和压电陶瓷的电压调制端口进行反馈，与通常的饱和吸收光谱技术相比，锁定后误差信号的阿仑方差得到明显改善。平均时间τ = 300秒时，激光器频率稳定度的阿仑方差σy(τ) = 6.6×10-13。
Based on the experiment of trapping single cesium atoms in magneto-optical trap (MOT), a grating-external-cavity diode laser which provides the cooling/trapping beams of MOT is locked to cesium 6S1/2 Fg = 4 → 6P3/2 Fe = 5 cycling transition by modulation-free polarization spectroscopy. This frequency locking method uses the dispersion-like curve generated from polarization spectroscopy as frequency-discriminating signal. The error signal is fed back to both current modulation port of diode laser and Voltage modulation port of Piezo-electric transducer (PZT). The Allan variance is used to evaluate the laser frequency stability. The modulation-free polarization spectroscopy locking technique can clearly improve the frequency stability compared with conventional saturation absorption spectroscopy technique. The Allan variance of frequency stability is σy(τ) = 6.6×10-13 as average time τ = 300s.
王婧、张天才、赵江艳、杨保东、王军民、何军
物理学光电子技术半导体技术
光栅外腔半导体激光器，偏振光谱，锁频，单原子，阿仑方差
rating-external-cavity diode laser，polarization spectroscopy，frequency stabilization，single atoms，the Allan variance
王婧,张天才,赵江艳,杨保东,王军民,何军.光栅外腔半导体激光器的无调制偏振光谱稳频及其在单原子磁光阱中的应用[EB/OL].(2008-03-29)[2025-08-16].http://www.paper.edu.cn/releasepaper/content/200803-913.点此复制
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