Superluminal and slow light propagation in a room-temperature solid
Superluminal and slow light propagation in a room-temperature solid
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DOI：
10.1126/science.1084429
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发表时间：
2003-07-11
期刊：
影响因子：
56.9
通讯作者：
Boyd, RW
中科院分区：
文献类型：
--
作者：
Bigelow, MS;Lepeshkin, NN;Boyd, RW
我们在室温下观察到紫翠宝石晶体中的超光速和超慢光传播。群速度慢至每秒91米，快至每秒-800米的测量和归因于相干人口振荡的影响，涉及铬离子在任何一个镜像或反转网站内的晶格。也就是说，在镜像站点中的离子是逆饱和的，并导致超光速光传播，而在反转站点中的离子经历传统的饱和吸收，并产生慢光。这种用于产生大组索引的技术比现有方法容易实现，因此适合于各种应用。
We have observed both superluminal and ultraslow light propagation in an alexandrite crystal at room temperature. Group velocities as slow as 91 meters per second to as fast as - 800 meters per second were measured and attributed to the influence of coherent population oscillations involving chromium ions in either mirror or inversion sites within the crystal lattice. Namely, ions in mirror sites are inversely saturable and cause superluminal light propagation, whereas ions in inversion sites experience conventional saturable absorption and produce slow light. This technique for producing large group indices is considerably easier than the existing methods to implement and is therefore suitable for diverse applications.