光子学报, 2010, 39 (11): 1998, 网络出版: 2010-12-07
飞秒脉冲通过多层体光栅后的衍射光强分布
Diffractive Light Intensity Distribution of Multilayer Volume Gratings Illuminated by Femtosecond Pulse
飞秒脉冲 多层光栅 衍射 衍射光强谱 瞬时衍射光强 Femtosecond pulse Stratified volume grating Diffraction Diffraction intensity spectrum Instantaneous diffraction intensity
摘要
基于单层体光栅的耦合波理论和矩阵光学知识,推导出飞秒脉冲通过多层体光栅衍射后的耦合波方程,并由此得到衍射光强谱和瞬时衍射效率表达式.研究结果发现衍射光强谱和瞬时衍射光强分布是与多层体光栅的结构参量,如中间填充层厚度、光栅层厚度、光栅常量及体光栅材料的折射率调制度有关系的.通过调节这些参量,获得了不同形状和不同宽度的衍射脉冲.该结果可用于设计基于多层体光栅的光通信和光脉冲整形器件.
Abstract
Based on the coupledwave theory of single volume grating and matrix theory, the coupledwave equation of stratified volume grating illuminated by femtosecond pulse is acquired. Solutions for the diffraction intensity spectrum and instantaneous diffraction intensity are obtained. The research results show that the diffraction characteristics depend on the parameters of the stratified gratings, such as the thickness of the buffer layers and grating layers, grating periods and the refractive index modulations of the grating. Through modulating these parameters, diffraction pulses with different shapes and bandwidths can be obtained. The results will be utilized to design devices employed in optical communication and pulse shaping.
朱荣, 阎晓娜, 梁玲亮, 何晓明. 飞秒脉冲通过多层体光栅后的衍射光强分布[J]. 光子学报, 2010, 39(11): 1998. ZHU Rong, YAN Xiaona, LIANG Lingliang, HE Xiaoming. Diffractive Light Intensity Distribution of Multilayer Volume Gratings Illuminated by Femtosecond Pulse[J]. ACTA PHOTONICA SINICA, 2010, 39(11): 1998.