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

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-...

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Published inChinese physics B Vol. 26; no. 7; pp. 149 - 152
Main Author 李东伟 张兰芝 Saba Zafar 宋鹤 郝作强 奚婷婷 高勋 林景全
Format Journal Article
LanguageEnglish
Published 01.06.2017
Subjects
MLA
激光列阵
石英微透镜阵列
石英晶体
紫外波段
能量转换效率
超连续谱
飞秒
Online AccessGet full text
ISSN1674-1056
2058-3834
DOI10.1088/1674-1056/26/7/074213

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Summary: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.
Bibliography: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.
Dongwei Li1,Lanzhi Zhang1,Saba Zafar1,He Song1,Zuoqiang Hao1,Tingting Xi2,Xun Gao1,Jingquan Lin1（ 1 School of Science, Changchun University of Science and Technology, Changchun 130022, China ; 2School of Physics, University of Chinese Academy of Sciences, Beijing 101407, China）
filamentation; supercontinuum generation; microlens array; fused silica
11-5639/O4
ISSN:1674-1056
2058-3834
DOI:10.1088/1674-1056/26/7/074213