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Type I and type II second harmonic generation of conically refracted beams

机译:圆锥形折射光束的I型和II型二次谐波产生

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摘要

Type I and type II second harmonic generation (SHG) of a beam transformed by the conical refraction phenomenon are presented. We show that, for type I, the second harmonic intensity pattern is a light ring with a point of null intensity while, for type II, the light ring possesses two dark regions. Taking into account the different two-photon processes involved in SHG, we have derived analytical expressions for the resulting transverse intensity patterns that are in good agreement with the experimental data. Finally, we have investigated the spatial evolution of the second harmonic signals, showing that they behave as conically refracted beams.
机译:给出了由圆锥折射现象转换后的光束的I型和II型二次谐波产生(SHG)。我们表明,对于类型I,二次谐波强度模式是一个光强度为零的光环,而对于类型II,该光环具有两个暗区。考虑到SHG中涉及的不同双光子过程,我们得出了所得横向强度图案的解析表达式,该表达式与实验数据非常吻合。最后,我们研究了二次谐波信号的空间演化,表明它们表现为锥形折射光束。

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