Gavrielides A, Peterson P
Opt Lett. 1990 Jul 15;15(14):780-2. doi: 10.1364/ol.15.000780.
We derive the diffractive transfer functions in uniaxial crystals for the parametric processes of upconversion and downconversion with an undepleted plane-wave pump. This description is for Type I or Type II phase matching in either positive or negative uniaxial crystals. Our results agree closely with an experiment in KD*P in which the pump, signal, and idler wavelengths are 1.064, 1.064, and 0.532 , microm and the polarizations are extraordinary, ordinary, and extraordinary, respectively. We show that the idler output intensity is a slightly elliptical ring displaced from the ordinary ray in the direction of the Poynting vector walk-off. The experimental and theoretical spatial frequencies describing the position of the idler intensity ellipse agree closely.
我们推导了单轴晶体中在未耗尽平面波泵浦情况下上转换和下转换参量过程的衍射传递函数。此描述适用于正单轴晶体或负单轴晶体中的I型或II型相位匹配。我们的结果与在磷酸二氘钾（KD*P）晶体中的实验结果非常吻合，在该实验中，泵浦光、信号光和闲频光的波长分别为1.064、1.064和0.532微米，偏振分别为非寻常光、寻常光和非寻常光。我们表明，闲频光输出强度是一个略呈椭圆形的环，在坡印廷矢量离散方向上偏离寻常光线。描述闲频光强度椭圆位置的实验和理论空间频率非常吻合。
