Observation of second-order hyper-Raman generation in LiNbO3 whispering-gallery mode disk resonators.
Observation of second-order hyper-Raman generation in LiNbO3 whispering-gallery mode disk resonators.
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DOI：
10.1364/ol.36.003027
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发表时间：
2011-07
期刊：
影响因子：
3.6
通讯作者：
M. Simons;I. Novikova
中科院分区：
文献类型：
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作者：
M. Simons;I. Novikova
在这封信中，我们报告的实验演示的非线性频率转换在几个光学频率的回音壁模式谐振器（WGMR）。由于WGMR内部非线性相互作用的增强，1064 nm泵浦场与LiNbO（3）盘的相互作用在室温（低于相位匹配温度>100 °C）下产生了微弱但可测量的532 nm非相位匹配二次谐波场，泵浦功率为几十毫瓦。对于更高的泵浦功率，我们观察到在545，559，573和587 nm处产生四个额外的场。在LiNbO（3）晶体中，两个连续场之间的相对光谱位移对应于455 cm（-1）振动模。我们的初步分析表明，这些领域是一个多声子超拉曼散射的结果，其中两个光子的泵浦场转换成一个光子的较高的频率场和一个或几个光学声子。
In this Letter we report experimental demonstration of nonlinear frequency conversion at several optical frequencies in a whispering-gallery mode resonator (WGMR). Because of the enhancement of nonlinear interactions inside a WGMR, interaction of a 1064 nm pump field with a LiNbO(3) disk produced a weak but measurable non-phase-matched 532 nm second-harmonic field at room temperature (>100 °C below the phase-matching temperature) for pump powers of a few tens of milliwatts. For higher pump powers, we observed the generation of four additional fields at 545, 559, 573, and 587 nm. The relative spectral shift between two consecutive fields corresponds to a 455 cm(-1) vibrational mode in LiNbO(3) crystal. Our preliminary analysis indicates that these fields are the result of a multiphonon hyper-Raman scattering in which two photons of the pump field are converted into one photon of a higher-frequency field and one or several optical phonons.