曝光剂量与体布喇格光栅衍射特性的研究  

Influence of UV-exposure on the Diffraction Characteristics of Volume Bragg Grating

作　　者：熊宝星[1] 张桂菊[1] 邹快盛[1] XIONG Bao-xing;ZHANG Gui-ju;ZOU Kuai-sheng(College of Physics, Optoelectronics and Energy, Soochow University, Suzhou , Jiangsu 215006, China)

机构地区：[1]苏州大学物理与光电能源学部,江苏苏州215006

出　　处：《光子学报》2018年第7期11-17,共7页Acta Photonica Sinica

基　　金：国家重大科学仪器设备开发专项基金(No.2016YFF0100902)资助~~

摘　　要：采用分振幅双光束干涉法和"二步法"热处理工艺,在光热敏折变微晶玻璃中制备了周期2.1μm的透射型体布喇格光栅,研究了不同曝光剂量与光栅衍射效率和角度选择性之间的关系.当曝光剂量逐渐增至为0.6J/m^2时,光栅的衍射效率最高达80.02%;随着曝光剂量的继续增加,光栅的衍射效率逐渐下降,并最终保持稳定.当曝光剂量达到1.5J/cm^2及以上时,光栅对测试光的吸收变化小于5%,此时光栅的衍射效率趋于稳定.曝光剂量的变化对光栅角度选择性没有明显的影响.分析结果表明随着曝光剂量增大,光栅中的含银胶团对532nm测试光的吸收加剧,从而使透过的衍射光强减弱,出现衍射效率降低的现象.Volume Bragg grating with the grating period 2.1μm was recorded in the photo-thermorefractive glass with laser amplitude-split interference and ＂ two-step＂ heat treatment process.The diffraction efficiency and angular selectivity of Bragg grating are very much affected by the laser dosage.The He-Cd laser with UV wavelength 325 nm is used.With the increase of UV dosage,the diffraction efficiency increases constantly.When the UV dosage increases to 0.6 J/m^2,the diffraction efficiency of the grating reaches the maximum value of 80.02%.,The efficiency will decrease as the UV dosage increases more than 0.6 J/m^2 and remain a stable value as the dosage reaches at 1.5 J/m^2,while the grating absorption change is less than 5%.The grating angle selectivity remains stable as the dosage changes.The experiment results show that the increase of UV dosage enhances the silver containing particles absorption at work wavelength 532 nm.The transmitted diffraction light was attenuated and the diffraction efficiency decreased.

关 键 词：体布喇格光栅 曝光剂量 吸收 衍射效率 角度选择性 

分 类 号：TN244[电子电信—物理电子学] TN241