切趾体光栅在高功率光束下的衍射特性分析  

Analysis of Diffraction Characteristics for the Apodized Volume Grating in the High Power Laser Beam

作　　者：王军阵[1] 汪岳峰[1] 白慧君[1] 

机构地区：[1]军械工程学院电子与光学工程系,石家庄050003

出　　处：《微纳电子技术》2013年第11期677-682,共6页Micronanoelectronic Technology

摘　　要：基于波动方程,采用光束传输法,研究了sinc切趾体布拉格光栅的衍射特性,并验证了该方法的有效性。分析了因温度升高引起的背景折射率的变化对sinc切趾体布拉格光栅衍射效率的影响,分析了由高功率导致的sinc切趾体光栅形变对高斯光束衍射后的光强分布的影响。结果表明:光束传输法可以精确求解sinc切趾体光栅的光谱衍射效率,还可以计算经sinc切趾体光栅衍射后的衍射光束的光强分布;随着背景折射率的增加,sinc切趾体光栅的谱选择窗口漂移会越来越大;随着sinc切趾体光栅形变的增大,光栅的衍射效率会明显减小,且光强分布畸变会越来越严重。这为sinc切趾体光栅在高功率激光中的应用提供了指导。Based on the wave equation, the diffraction characteristics of sinc-apodized volume Bragg gratings were studied by the beam propagation method, and the validity of the method was verified. The effect of the background refractive index change caused by the temperature increase on the diffraction efficiency and the effect of the distortion of the sinc-apodized volume Bragg gratings caused by the high power on the intensity distribution of the gauss beam after the diffrac- tion were analyzed. The results show that the beam propagation method can precisely calculate the diffraction efficiency of the sinc-apodized volume Bragg gratings, and the intensity distribu- tion of the diffraction beam diffracted by the sinc-apodized volume Bragg gratings; the shift of the spectral window increases with the increase of the background refractive index the diffraction ef- ficiency decreases obviously with the increase of the distortion of the sinc-apodized volume Bragg gratings, and the distortion of intensity distribution becomes more serious. The results provide guidance for the sinc-apodized volume Bragg gratings in the application of the high power lasers.

关 键 词：体布拉格光栅 sinc切趾 光束传输法 衍射特性 高功率激光 

分 类 号：O438.1[机械工程—光学工程]