Comment on “Unidirectional radiation of widely tunable THz wave using a prism coupler under noncollinear phase matching condition” [Appl. Phys. Lett. 71, 753 (1997)]
Comment on “Unidirectional radiation of widely tunable THz wave using a prism coupler under noncollinear phase matching condition” [Appl. Phys. Lett. 71, 753 (1997)]
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对“非共线相位匹配条件下使用棱镜耦合器的宽可调太赫兹波的单向辐射”的评论 [Appl. 71, 753 (1997)]
DOI：
10.1063/1.122840
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发表时间：
1998
影响因子：
4
通讯作者：
J. Bevan
中科院分区：
文献类型：
--
作者：
T. Walther;Kimberly R. Chapin;J. Bevan
川濑等人。描述了一种远红外 FIR，150-290 m 源，基于 LiNbO3 光学参量振荡器，由 P 1.064 m 的 Nd: YAG 激光器泵浦。 1 随着 FIR 输出波长 (T) 的调谐，实际应用严格要求固定输出方向。川濑等人。利用连接到非线性晶体的硅棱镜作为输出耦合器，并基于两个近似得出 FIR 输出方向在很大程度上与波长无关：1 T P 和 2 近红外无色散，即 LiNbO3 中闲频光 ni 和泵浦辐射 np 的折射率相同。我们研究这些近似值是否合理。利用不同界面处的相位匹配关系、能量守恒和斯涅耳定律，FIR 辐射的输出角 pa 产生无任何近似值 sin pa nT c sin arcsin ni
Kawase et al. described a far-infrared FIR, 150–290 m source based on an optical parametric oscillator in LiNbO3 pumped by a Nd: YAG laser at P 1.064 m. 1 Practical applications stringently require fixed output direction as the FIR output wavelength (T) is tuned. Kawase et al. utilize a silicon prism attached to the nonlinear crystal as an output coupler and derive that the FIR output direction is largely independent of wavelength based on two approximations: 1 T P and 2 no dispersion in the near infrared, ie, the index of refraction of both the idler, ni and the pump radiation, np, in LiNbO3 are the same. We investigate whether these approximations are justified. Using the phasematching relation, energy conservation and Snell’s law at the various interfaces, the output angle of the FIR radiation pa yields without any approximations sin pa nT c sin arcsin ni