Bragg微腔中非线性介质相位共轭波的增强效应

The Enhancement Effect of the Phase-conjugation Waves of a Nonlinear Medium in the Bragg Microcavity

研究了由一维光子晶体构成的Bragg微腔(AB)N(D)2(BA)N中三阶非线性光学介质(NLM)产生的相位共轭波的增强效应。当入射光波与Bragg腔模满足共振条件时,推导了其相位共轭波的增强因子。Bragg微腔中的三阶NLM产生的相位共轭波相对于该介质裸露时产生的相位共轭波具有明显增强,这主要是Bragg微腔对入射泵浦光产生了较大的共轭增强作用。理论分析和数值计算结果还表明,当入射光波与Bragg腔模满足共振条件且周期数N较大时,该结构可等效于由Bragg反射镜组成的Fabry-Perot(F-P)腔。

The enhancement effect of the phase conjugation wave was studied, which was produced by a third order nonlinear optical medium（NLM） in a （AB）N（ D）2（ BA ）N Bragg microcavity made of one-dimensional photonic crystals. The gain factor of the ph.ase conjugation wave was derived out when the resonance condition was satisfied for incident optical wave and the Bragg microcavity mode. Because of stronger resonance enhancement to incident pump beam given by the Bragg microcavity,the enhancement effect of the phase conjugation wave produced by Bragg microcavity was more outstanding than that caused by naked third order NLM. The theoretical analysis and numerical calculation showed the Bragg microcavity with larger number N of periods identified with a Fabry-Perot （F-P） cavity when the resonance condition was satisfied for incident optical wave and the Bragg microcavity mode.