相位型光栅的衍射及分光功能  

Diffraction and splitting function of phase grating

作　　者：邹意蕴 林佳丽 卢悦媛 阎晓娜[1] ZOU Yi-yun;LIN Jia-li;LU Yue-yuan;YAN Xiao-na(Department of Physics,Science College,Shanghai University,Shanghai 200444,China)

机构地区：[1]上海大学理学院物理系,上海200444

出　　处：《大学物理》2021年第11期64-68,共5页College Physics

基　　金：上海市大学生创新创业训练计划(S201910280007);上海大学联合大作业项目“超快激光技术及其在通信和光谱检测领域的应用”资助。

摘　　要：利用相干叠加思想推导了平面波通过相位型光栅的衍射表达式.结果表明,相位光栅衍射可以实现将最大衍射光强集中在具有分光功能的±1级,克服了振幅光栅衍射中具有最大衍射光强的0级无分光功能的缺陷.讨论了相位层引入的相位、光栅占空比对±1级衍射光强的影响.利用相干叠加思想得到的衍射公式物理意义明确,便于掌握,并可应用于其他衍射结构.Using the coherent superposition,diffractions are deduced when a plane wave incidents on a phase grating.Results show that the±1 order diffraction of the phase grating can get the maximum intensity and realize the splitting function,overcoming the problems in amplitude grating where the 0 order diffraction has the maximum intensity but with no splitting function.The diffraction efficiency of±1 order diffraction with respect to the duty ratio and phase introduced by the phase material are discussed.The method we provided here has implicit physical meanings and is easy to adapt to other diffraction structure.

关 键 词：相位光栅 衍射 衍射效率 分光功能 

分 类 号：O436[机械工程—光学工程]