它们有着较大的非线性极化系数，在非线性光学应用中有广阔的前景。
They demonstrate high second - order nonlinear optical hyperpolarizability values and show vast vistas in the nonlinear optics .
利用简并四波混频（DFWM）方法测量二元分子卟啉酞菁的三阶非线性极化系数X（3）值。
The values of third-order susceptibilities X(3) of porphyrin-phthalocyanine heterodimers have been measured by degenerate four-wave mixing (DFWM) method.
考虑到离散角的影响，给出了单轴晶体中有效非线性极化系数的精确计算公式，并给出了计算举例。
Considering the effect of walk-off Angle, the accurate calculation of effective nonlinear optical coefficient of uniaxial crystal is presented, a example of calculation of BBO is given.
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