基于透射体布拉格光栅频谱组束的研究  

Study of spectral beam combining based on transmitting volume Bragg grating

作　　者：占生宝[1] 赵尚弘[1] 胥杰[1] 吴卓亮[1] 李云霞[1] 

机构地区：[1]空军工程大学电讯工程学院,陕西西安710077

出　　处：《光电子．激光》2008年第3期318-321,共4页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金资助项目(60678018)

摘　　要：分析了透射体布拉格光栅实现两束不同波长光束频谱组束的条件。基于耦合波理论,推导了透射体布拉格光栅的衍射效率方程,获得了优化的组束设计条件,提出了使用凸透镜控制光束入射角的方法。建立了组束的理论模型,分析了光栅参数对衍射效率的影响。结果表明:最佳组束时,不同的光栅厚度须选择不同的光栅参数;在折射率调制和空间频率不变的情况下,随着光栅厚度的减小,谱选择性逐渐增大;随着光束发散的增大,光栅的衍射效率逐渐减小。The condition of spectral beam combining,which uses transmitting volume Bragg grating for two laser beams with different wavelengths,was analyzed. Based on coupled-wave theory,the diffraction efficiency equation of Bragg grating was derived. An optimal design requirement of spectral beam combining was obtained,and an approach to control the beam incident angle by using a convex lens was proposed. On the basis of the optimal deaign,spectral beam combining was modeled, and the effect of grating parameter on diffraction efficiency was analyzed. It shows that different grating parameters must be selected for different grating thickness,and spectral selectivity increases gradually with decrease of grating thickness at same refractive-index modulation and spatial frequency. This study further shows that grating diffraction efficiency decreases grad-ually with increase of beam divergence.

关 键 词：透射体光栅 光栅参数 布拉格衍射 衍射效率 频谱组束 

分 类 号：TN241[电子电信—物理电子学]