Enhanced nonlinear optical response of layered WSe1.4Te0.6 alloy in 1 μm passively Q-switched laser  

作　　者：Zhengting Du Tianqi Zhang Zhenda Xie Jian Ning Xinjie Lü Jinlong Xu Shining Zhu 杜正婷;张天琦;谢臻达;宁建;吕新杰;徐金龙;祝世宁(College of Engineering and Applied Sciences,National Laboratory of Solid State Microstructures,Nanjing University,Nanjing 210093,China;School of Electronic Science and Engineering,Nanjing University,Nanjing 210093,China)

机构地区：[1]College of Engineering and Applied Sciences,National Laboratory of Solid State Microstructures,Nanjing University,Nanjing 210093,China [2]School of Electronic Science and Engineering,Nanjing University,Nanjing 210093,China

出　　处：《Chinese Optics Letters》2019年第12期59-63,共5页中国光学快报（英文版）

基　　金：supported by the National Key R&D Program of China(No.2017YFA0303700);the National Natural Science Foundation of China(Nos.11774161,51890861,and 11674169);the Key Research Program of Jiangsu Province(No.BE2015003-2)

摘　　要：Due to the composition-dependent properties of two-dimensional(2D)transition metal dichalcogenides(TMDs),alloying of existing dissimilar TMDs architecture is a novel and controllable route to tailor crystal structures with superior optical and optoelectronic properties.Here,we reported the hexagonal-phase WSe1.4Te0.6 alloy can enable great promise for enhanced saturable absorption response exceeding the parent component WSe2 and WTe2,with larger modulation depth and lower saturable intensity.These advantages allowed the 1064 nm passively Q-switched lasers based on WSe1.4Te0.6 to be more efficient,with pulse duration narrowed to 45%,and slope efficiency increased by 232%.Our findings highlighted the appropriate alloying of TMDs as an effective strategy for development of saturable absorbers.Due to the composition-dependent properties of two-dimensional（2D） transition metal dichalcogenides（TMDs）, alloying of existing dissimilar TMDs architecture is a novel and controllable route to tailor crystal structures with superior optical and optoelectronic properties. Here, we reported the hexagonal-phase WSe1.4Te0.6 alloy can enable great promise for enhanced saturable absorption response exceeding the parent component WSe2 and WTe2, with larger modulation depth and lower saturable intensity. These advantages allowed the 1064 nm passively Q-switched lasers based on WSe1.4Te0.6 to be more efficient, with pulse duration narrowed to 45%, and slope efficiency increased by 232%. Our findings highlighted the appropriate alloying of TMDs as an effective strategy for development of saturable absorbers.

关 键 词：SWITCHED PASSIVE OPTICAL 

分 类 号：TG146.411[一般工业技术—材料科学与工程] TN248.34[金属学及工艺—金属材料]