Measurement of nonlinear properties and optical limiting ability of Rhodamine6G doped silica and polymeric samples
- 作者：Sunita Sharma ; Devendra Mohan ; S.K. Ghoshal
- 关键词：Nonlinear refractive index ; Nonlinear absorption coefficient ; Poly-methylmethacrylate ; Silica gel matrices ; Optical limiters ; Rhodamine6G
- 刊名：Optics Communications
- 出版年：2008
- 期刊代码：50_00304018
- 类别：ph
- 出版时间：15 May 2008
- 卷：281
- 期：10
- 页码：2923-2929
- 文件大小：155 K
摘要
The third order nonlinear optical properties of Rhodamine6G (Rh6G) doped silica and polymeric samples have been investigated using single beam z-scan technique under excitation by the second harmonic of Nd:YAG laser beam (532 nm). The nonlinear refractive index, nonlinear absorption coefficient, real and imaginary parts of third order nonlinear susceptibility in the samples of silica and poly-methylmethacrylate (PMMA) matrices are measured. Thermal contribution to the nonlinear refractive index in case of undoped silica samples has been calculated in order to have better accuracy of the material response contribution to third order nonlinearity. The comparative study of the optical limiting performance of Rh6G doped silica and polymeric samples show that Rh6G doped silica is relatively superior for optical limiting applications.