Propagation of optical pulses in a resonantly absorbing medium: Observation of negative velocity in Rb vapor
Propagation of optical pulses in a resonantly absorbing medium: Observation of negative velocity in Rb vapor
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DOI：
10.1103/physreva.68.053801
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发表时间：
2003-11
影响因子：
2.9
通讯作者：
H. Tanaka;H. Niwa;K. Hayami;S. Furue;K. Nakayama;T. Kohmoto;M. Kunitomo;Y. Fukuda
中科院分区：
文献类型：
--
作者：
H. Tanaka;H. Niwa;K. Hayami;S. Furue;K. Nakayama;T. Kohmoto;M. Kunitomo;Y. Fukuda
研究了光脉冲在共振吸收介质中的传播。测量了 Rb ${D}_{1}$ 跃迁的纳秒脉冲的传播时间。在两条吸收线的中心，观察到脉冲峰值的延迟，约为脉冲宽度的十倍，其中零延迟被定义为真空中光速传播。另一方面，在吸收线的峰值处，观察到大吸收的负延迟，其中提前时间高达脉冲宽度的 25%。包括吸收和相移效应的仿真很好地再现了实验结果。
Propagation of optical pulses in a resonantly absorbing medium is studied. Propagation time of nanosecond pulses was measured for the Rb ${D}_{1}$ transition. At the center of two absorption lines, delay of the pulse peak which is about ten times as large as the pulse width was observed, where zero delay is defined for the propagation with the light velocity in vacuum. On the other hand, at the peak of an absorption line, negative delay was observed for large absorption, where the advance time is as large as 25% of the pulse width. Simulation including the effect of absorption and phase shift reproduced well the experimental results.