中国激光, 2018, 45 (8): 0809001, 网络出版: 2018-08-11  

基于聚合物分散液晶的二维六角晶格变间距光栅的研制 下载: 893次

Development of Two-Dimensional Hexagonal Lattice Variable Line-Space Grating Based on Polymer-Dispersed Liquid Crystal
作者单位
1 上海理工大学光电信息与计算机工程学院, 上海 200093
2 上海理工大学上海市现代光学系统重点实验室, 上海 200093
摘要
利用柱面波与平面波干涉形成一种二维(2D)全息聚合物分散液晶(H-PDLC)变间距光栅。为了使聚合物与液晶分离得更加彻底,采用曝光强度为16 mW/cm2、波长为532 nm的激光进行实验,并且两次曝光时间分别为2 s和60 s,通过将样品二次曝光和旋转60°形成2D六角晶格H-PDLC变间距光栅,分别研究了光栅的理论周期变化范围、衍射特性、电控特性以及影响光栅周期变化的参数分析。结果表明:在半径为6 mm的圆形范围内,光栅的周期变化区间为1.804~2.281 μm,与理论计算所得结果基本一致。在没有加载电压的情况下,一级衍射效率达18.3%,当加载电压达到90 V时,零级衍射效率由15.6%增加至73%。该光栅具有变周期和电控特性,在衍射光学领域具有潜在的应用价值,可用于染料掺杂2D H-PDLC光栅的可调谐多波长有机激光器的研究。
Abstract
A two-dimensional (2D) holographic polymer-dispersed liquid crystal (H-PDLC) variable line-space grating is fabricated by interference between cylindrical wave and plane wave. In order to separate polymer from liquid crystal more evidently, we use a 532 nm laser with exposure intensity of 16 mW/cm2 in experiment, and two exposure time is 2 s and 60 s, respectively. We use double exposure and rotate the sample 60° to form 2D hexagonal lattice H-PDLC variable line-space grating. The theoretical periodic variation rang of grating, diffraction properties, electronic control characteristics and analysis of parameters affecting the periodic change of grating are studied, respectively. The results show that, in the circular range with a radius of 6 mm, the periodic variation range of the grating is 1.804-2.281 μm, which is basically consistent with the theoretical calculation. The first-order diffraction efficiency is 18.3% without external voltage, and the zero-order diffraction efficiency increases from 15.6% to 73% with an applied voltage of 90 V. Due to variable period and electronic control characteristics, this grating has potential application in diffraction optics, such as the research of tunable multi-wavelength organic laser for dye-doped 2D H-PDLC grating.

缪涛, 郑继红, 王康妮, 刘悠嵘, 黄新荣, 朱天赟. 基于聚合物分散液晶的二维六角晶格变间距光栅的研制[J]. 中国激光, 2018, 45(8): 0809001. Miao Tao, Zheng Jihong, Wang Kangni, Liu Yourong, Huang Xinrong, Zhu Tianyun. Development of Two-Dimensional Hexagonal Lattice Variable Line-Space Grating Based on Polymer-Dispersed Liquid Crystal[J]. Chinese Journal of Lasers, 2018, 45(8): 0809001.

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!