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Enhancement of second-order optical nonlinearity in photo-darkened Ge25Sb10S65 chalcogenide glass by femtosecond laser light |
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| Authors: | Wei Liu Liying Liu Lei Xu Yinsheng Xu |
| Institution: | a The State Key Lab for Advanced Photonic Materials and Devices, Department of Optical Science and Engineering, School of Information Science and Engineering, Fudan University, Shanghai 200433, China b Lab of Advanced Materials, Fudan University, Shanghai 200433, China c Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China |
| Abstract: | The second-order optical nonlinearity of poled Ge25Sb10S65 chalcogenide glass was found to be 40-50% larger after femtosecond laser irradiation. The highest χ(2) was 11.4 pm/V. Raman spectral change indicated that centrosymmetric defects were created by fs light. These defects promoted the third-order optical nonlinearity of the glass and as a result, its second-order nonlinearity was also enhanced. The study shows that fs laser modification is an effective method of increasing the optical nonlinearity of photonic materials. |
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