Intense supercontinuum generation in the near-ultraviolet range from a 400-nm femtosecond laser filament array in fused silica  

作　　者：李东伟 张兰芝 Saba Zafar 宋鹤 郝作强 奚婷婷 高勋 林景全 

机构地区：[1]School of Science Changchun University of Science and Technology [2]School of Physics University of Chinese Academy of Sciences

出　　处：《Chinese Physics B》2017年第7期149-152,共4页中国物理B（英文版）

基　　金：Project supported by the National Basic Research Program of China(Grant No.2013CB922404);the National Natural Science Foundation of China(Grant Nos.11274053,11474039,11474040,and 11004240);the Science and Technology Department of Jilin Province,China(Grant No.20170519018JH);the Innovation Fund of Changchun University of Science and Technology,China(Grant No.XJJLG-2016-02)

摘　　要：An intense supercontinuum（SC） in the near-ultraviolet range is generated from filamentation by focusing a 400-nm laser into fused silica with a microlens array（MLA）. The spectrum of the SC is shown to be sensitive to the distance between the MLA and fused silica. In our optimal conditions, the near-ultraviolet SC can cover a range of 350-600 nm,where a bandwidth of approximately 55 nm above the 1μJ/nm spectral energy density and 20 nm bandwidth with tens ofμJ/nm are achieved. In addition, the energy conversion efficiency of the 400 nm laser for SC generation is further analyzed.A maximum conversion efficiency of 66% is obtained when the entrance face of fused silica is set around the focus of the MLA.An intense supercontinuum（SC） in the near-ultraviolet range is generated from filamentation by focusing a 400-nm laser into fused silica with a microlens array（MLA）. The spectrum of the SC is shown to be sensitive to the distance between the MLA and fused silica. In our optimal conditions, the near-ultraviolet SC can cover a range of 350-600 nm,where a bandwidth of approximately 55 nm above the 1μJ/nm spectral energy density and 20 nm bandwidth with tens ofμJ/nm are achieved. In addition, the energy conversion efficiency of the 400 nm laser for SC generation is further analyzed.A maximum conversion efficiency of 66% is obtained when the entrance face of fused silica is set around the focus of the MLA.

关 键 词：FILAMENTATION supercontinuum generation microlens array fused silica 

分 类 号：TN24[电子电信—物理电子学]