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Second harmonic generation (SHG) in one-dimensional nonlinear photonic crystals made from periodically alternating ferroelectric and dielectric layers is investigated by means of the transfer matrix method. When tuned at the photonic band gap (PBG) edges, the fundamental wave and second harmonic wave slow down, and the filed enhancement takes place within the nonlinear photonic crystal. The phase mismatching can be compensated for to some extent and the second harmonic process will be enhanced. Numerical results show that the enhancement of SHG in the PBG structure can be up to four orders of magnitude compared with the traditional quasi-phase-matching structure. 相似文献
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VISAR需满足准零程差条件才可能测量任意反射面的速度。分析了入射角和发散角的大小对标准具准零程差位置的影响;就全场干涉问题进行了剖析;模拟了静态调试时各种干涉条纹形状。 相似文献
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