Large and opposite changes of the third-order optical nonlinearities of chalcogenide glasses by femtosecond and continuous-wave laser irradiation

被引：13
|
作者：
Zhang, Qiming
Liu, Wei
Liu, Liying
Xu, Lei [1 ]
Xu, Yinsheng
Chen, Guorong
机构：
[1] Fudan Univ, Sch Informat Sci & Engn, Dept Opt Sci & Engn, State Key Lab Adv Photon Mat & Devices, Shanghai 200433, Peoples R China
[2] E China Univ Sci & Technol, Sch Mat Sci & Engn, Minist Educ, Key Lab Ultrafine Mat, Shanghai 200237, Peoples R China
来源：
APPLIED PHYSICS LETTERS | 2007年 / 91卷 / 18期
基金：
中国国家自然科学基金;
关键词：
D O I：
10.1063/1.2805636
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We report that the nonlinear refractive index (n(2)) of As2S3 glass can be enhanced after irradiation by a femtosecond laser but suppressed after irradiation by a continuous-wave (cw) laser, although both the femtosecond laser and cw laser induce photodarkening in the glass. Photodarkening by the femtosecond laser increases n(2) by as much as 50%, while irradiation by a subbandgap cw laser decreases n(2) by as much as 60% of its original value. The results provide a way to manipulate the third-order optical nonlinearity of this photonic glass. Mechanisms of the optical nonlinearity changes are discussed. (C) 2007 American Institute of Physics.
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页数：3
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