Purcell-enhanced Raman scattering from atmospheric gases in a high-finesse microcavity
Purcell-enhanced Raman scattering from atmospheric gases in a high-finesse microcavity
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DOI：
10.1103/physreva.89.023811
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发表时间：
2014-02-10
影响因子：
2.9
通讯作者：
Muller, Andreas
中科院分区：
文献类型：
--
作者：
Petrak, Benjamin;Djeu, Nicholas;Muller, Andreas
我们证明了珀塞尔自发发射增强效应的拉曼散射气体在一个类似10 μ m长的法布里-珀罗微腔与模式体积类似100 μ m（3）和峰值精细度为50 000。该腔通过谐振再循环增加泵浦激光强度，同时通过修改腔内电磁真空场的态密度来增强拉曼散射到单独腔模式中的速率。结果是与自由空间发射到与腔相同的立体角中相比，总体增强了类似于10（7），使得仅需要微量样品量的痕量气体感测成为可能。
We demonstrate the Purcell spontaneous-emission enhancement effect for Raman scattering from gases in a similar to 10-mu m-long Fabry-Perot microcavity with a mode volume of similar to 100 mu m(3) and a peak finesse of 50 000. The cavity increases the pump laser intensity by resonant recirculation while simultaneously enhancing the rate of Raman scattering into a separate cavity mode by modification of the density of states of the intracavity electromagnetic vacuum field. The result is an overall enhancement of similar to 10(7) compared to free-space emission into the same solid angle as the cavity, enabling trace gas sensing requiring only minute sample quantities.