在室温下观测到了固体材料中的慢光现象。用氩离子激光(514.5 nm)单光束入射到红宝石晶体中,用相干布居数振荡效应产生烧孔。利用光谱烧孔使介质折射率发生急剧变化,导致光的群速变慢。实验上观测的时延为(2.314±0.005) ms,推断光速值为(43.215±0.094) m/s,并观测到时延和光的群速随调制频率变化的规律。

Slow light propagation in solid state material is initially observed at room temperature. The slowdown of light resulting from dramatic change of refractive index by spectra hole which is produced by coherent population oscillation is investigated in a ruby crystal at 514.5 nm from Ar+ laser. Measured delay is about (2.314±0.005) ms, corresponding to group velocity as low as (43.215±0.094) m/s. The variation of the delay and the group velocity with modulation frequencies is observed in the experiment.