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

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Title: Large and opposite changes of the third-order optical nonlinearities of chalcogenide glasses by femtosecond and continuous-wave laser irradiation
Author(s): Zhang, Qiming; Liu, Wei; Liu, Liying; Xu, Lei; Xu, Yinsheng; Chen, Guorong
Abstract: We report that the nonlinear refractive index (n2) 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 n2 by as much as 50%, while irradiation by a subbandgap cw laser decreases n2 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.
Publication type: Journal article
Source: Applied Physics Letters, Vol. 91, no. 18 (2007), paper no. 181917
Publication year: 2007
FOR Code(s): 01 Mathematical Sciences; 02 Physical Sciences; 09 Engineering
Keyword(s): Chalcogenide glasses; Continuous-wave lasers; Femtosecond lasers; Irradiation; Nonlinear refractive index; Optical properties
Publisher: American Institute of Physics
ISSN: 0003-6951
Publisher URL: http://dx.doi.org/10.1063/1.2805636
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