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《Chinese Journal of Lasers》 2018-12
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Realization of Optical Modulation in Germanium Oxide Glass by Femtosecond Laser Direct Writing

Zhang Fangteng;Nie Zhaogang;Qiu Jianrong;School of Physics and Photoelectric Engineering,Guangdong University of Technology;State Key Laboratory of Luminescent Materials and Devices,School of Materials Science and Engineering,South China University of Technology;State Key Laboratory of Modern Optical Instrumentation,College of Optical Science and Engineering,Zhejiang University;  
The structural characteristics and the key influencing factors of self-assembled nanogratings within GeO2 glass are investigated by using an ultrafast laser system with tunable repetition rate and pulse duration.The formation threshold of nanogratings in GeO2 glass is experimentally determined,which is dependent on material bandgap and laser pulse duration.In addition,based on the optimization of process parameters and the use of birefringence of nanogratings,the micro-optical components are fabricated within GeO2 glass and their functions are demonstrated.Moreover,the influence of repetition rate of femtosecond laser on the formation and structural properties of nanogratings is also analyzed.It is found that the birefringence strength of nanograting in GeO2 glass has an anomalous polarization dependence,and the corresponding origin is speculated.
【Fund】: 国家自然科学基金(11774071 11704079);; 广东工业大学“百人计划”启动基金(220418098)
【CateGory Index】: TH74;TN249
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