光学学报, 2009, 29 (12): 3260, 网络出版: 2009-12-23   

反射型体光栅对超短脉冲高斯光束衍射特性分析

Laser Beam by Reflecting Volume Grating
作者单位
1 国防科技大学 光电科学与工程学院,湖南 长沙 410073
2 空军工程大学 电讯工程学院,陕西 西安 710077
3 国防科技大学 理学院,湖南 长沙 410073
4 中国工程物理研究院 激光聚变研究中心,四川 绵阳 621900
摘要
基于Kogelnik一维耦合波理论以及离散傅里叶变换,分析反射型体光栅对一定时、空域分布的激光光束的衍射特性,给出衍射光束在时、空域光强分布的表达式;模拟计算体光栅对超短脉冲高斯光束的衍射效果,给出衍射光束时、空域光强分布与光栅各参量的变化关系。结果表明,提高光栅的折射率调制度或适当选择光栅的周期,可增加反射型体光栅的角谱和光谱衍射带宽;增加光栅的厚度,可以使体光栅具有较高的衍射效率;此时,当超短脉冲高斯光束的中心波矢满足体光栅布拉格条件入射时,衍射光束的时、空域光强分布与入射光束的分布基本一致,衍射效率高达95%以上,这给反射型体光栅对超短脉冲高斯光束的空间低通滤波提供了理论指导。
Abstract
Based on the discrete Fourier transform and Kogelnik′s one-dimensional coupled-wave theory,the characteristics of the laser beam with arbitrary shapes in both temporal and spatial domains diffracted by reflecting volume grating are analyzed. The intensity distributions of the diffractive laser beam in both temporal and spatial domain are formulated. The diffraction performances of the ultra-short pulsed Gaussian laser beam by reflecting volume grating are specifically simulated. The results show that by increasing the grating′s refractive index modulation or selecting the appropriate grating′s period,the angular spectrum and light spectrum of diffractive bandwidth can be broadened;through enlarging the grating′s thickness,its high diffraction efficiency can be achieved. And in this situation,when the central vector of the ultra-short pulsed Gaussian laser beam satisfies the grating′s Bragg condition,the intensity distributions of the diffractive laser beam both in temporal domain and spatial domain are similar to those of the input laser beam,and the diffraction efficiency is greater than 95%. And the results are instructive for the low-pass spatial filtering of ultra-short pulsed Gaussian laser beam diffracted by reflecting volume grating.

郑光威, 谭吉春, 何焰蓝, 刘莉, 王晓东, 王逍, 郑浩斌. 反射型体光栅对超短脉冲高斯光束衍射特性分析[J]. 光学学报, 2009, 29(12): 3260. Zheng Guangwei, Tan Jichun, He Yanlan, Liu Li, Wang Xiaodong, Wang Xiao, Zheng Haobin. Laser Beam by Reflecting Volume Grating[J]. Acta Optica Sinica, 2009, 29(12): 3260.

本文已被 4 篇论文引用
被引统计数据来源于中国光学期刊网
引用该论文: TXT   |   EndNote

相关论文

加载中...

关于本站 Cookie 的使用提示

中国光学期刊网使用基于 cookie 的技术来更好地为您提供各项服务,点击此处了解我们的隐私策略。 如您需继续使用本网站,请您授权我们使用本地 cookie 来保存部分信息。
全站搜索
您最值得信赖的光电行业旗舰网络服务平台!