光栅周期包含的Bragg层数对Bragg型凹面衍射光栅的影响

发布时间：2018-04-12 00:11

本文选题：波分复用 + 凹面衍射光栅　；参考：《物理学报》2017年22期

【摘要】：单个衍射光栅周期所包含的Bragg周期层数是连续Bragg齿型凹面衍射光栅的主要参数之一,该参数可改变光栅齿结构,对凹面衍射光栅的分辨力.自由光谱范围及衍射效率有重要影响.本文通过理论分析与仿真模拟,对比了4种不同层数的Bragg型凹面衍射光栅的特性参数.研究结果表明:在衍射光栅尺寸不变的情况下,改变单个光栅周期包含的Bragg周期层数不会显著提高器件主衍射级次的分辨力;单个光栅周期包含的Bragg周期层数与光栅可衍射的级次数成正相关.单周期层数的Bragg凹面衍射光栅的主衍射级次效率最高,其可衍射的级次数最少,且其他衍射级次分散的能量最少;增加单个光栅周期所包含的Bragg周期层数会降低主衍射级次的自由光谱范围.该研究对于设计低插损、高分辨率、宽工作波段的波分复用器或光栅光谱仪具有重要的指导意义.
[Abstract]:The number of Bragg periodic layers contained in a single diffraction grating period is one of the main parameters of concave diffraction grating with continuous Bragg teeth. This parameter can change the structure of grating teeth and the resolution of concave diffraction grating.The range of free spectrum and diffraction efficiency are very important.Through theoretical analysis and simulation, the characteristic parameters of four kinds of Bragg concave diffraction gratings with different layers are compared.The results show that the resolution of the main diffraction order will not be improved significantly by changing the number of Bragg periodic layers contained in a single grating period when the size of the diffraction grating is invariable.The number of Bragg periodic layers contained in a single grating period is positively correlated with the diffraction order number of the grating.The main diffraction order efficiency of Bragg concave diffraction grating with single period layer number is the highest, the number of diffraction order is the least, and the energy of other diffraction order dispersion is the least.Increasing the number of Bragg periodic layers in a single grating period decreases the free spectral range of the main diffraction order.This study is of great significance to the design of wavelength division multiplexer or grating spectrometer with low insertion loss, high resolution and wide working band.
【作者单位】：西安交通大学电子物理与器件教育部重点实验室陕西省信息光子技术重点实验室;
【基金】：江苏省科技支撑计划(批准号:BE2016133)资助的课题~~
【分类号】：TN25

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