Fast-light in a photorefractive crystal for gravitational wave detection
Fast-light in a photorefractive crystal for gravitational wave detection
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DOI：
10.1364/oe.16.020448
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发表时间：
2008-12-08
期刊：
影响因子：
3.8
通讯作者：
Shahriar, M. S.
中科院分区：
文献类型：
--
作者：
Yum, H. N.;Salit, M.;Shahriar, M. S.
我们使用两个频率复用泵浦光束在 Ce:BaTiO3 光折变晶体中产生增益双合态来演示超光速光传播。两条增益线是通过探测场和两个单独的泵浦场之间的双波混合获得的。泵的角频率根据探头的频率对称地调谐。泵浦之间的频率差对应于两条增益线的分离；随着它的增加，晶体逐渐从不失谐的正常色散转变为异常色散介质。与通过空白空间传播的相同脉冲相比，通过增益间隔为 2Hz 的介质传播的脉冲的时间提前量为 0.28 秒。我们还使用修改后的实验配置直接演示了反常色散分布。最后，我们讨论如何利用更快的光折变晶体（例如 SPS：Sn2P2S6）中这种方式产生的反常色散来增强白光腔增强的 LIGO 型引力波探测器的灵敏度带宽积。 (C) 2008 美国光学学会
We demonstrate superluminal light propagation using two frequency multiplexed pump beams to produce a gain doublet in a photorefractive crystal of Ce:BaTiO3. The two gain lines are obtained by two-wave mixing between a probe field and two individual pump fields. The angular frequencies of the pumps are symmetrically tuned from the frequency of the probe. The frequency difference between the pumps corresponds to the separation of the two gain lines; as it increases, the crystal gradually converts from normal dispersion without detuning to an anomalously dispersive medium. The time advance is measured as 0.28 sec for a pulse propagating through a medium with a 2Hz gain separation, compared to the same pulse propagating through empty space. We also demonstrate directly anomalous dispersion profile using a modified experimental configuration. Finally, we discuss how anomalous dispersion produced this way in a faster photorefractive crystal (such as SPS: Sn2P2S6) could be employed to enhance the sensitivity-bandwidth product of a LIGO type gravitational wave detector augmented by a White Light Cavity. (C) 2008 Optical Society of America