Experimental and theoretical study of higher-order nonlinearities in chalcogenide glasses

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• 作者：Boudebs ; G. ; Cherukulappurath ; S. ; Leblond ; H. ; Troles ; J. ; Smektala ; F. ; Sanchez ; F.
• 关键词：42.70.Km ; 42.65.-k ; 42.65.Tg ; Chalcogenide glasses ; Mach&ndash ; Zehnder interferometer ; Nonlinear refractive index ; Fourier transform ; Nonlinear absorption
• 刊名：Optics Communications
• 出版年：2003
• 期刊代码：50_00304018
• 类别：ph
• 出版时间：April 15, 2003
• 卷：219
• 期：1-6
• 页码：427-433
• 文件大小：247 K

摘要

We investigate experimentally and theoretically the nonlinear properties of two distinct chalcogenide glasses. Nonlinearities are measured through a spatially resolved Mach&ndash;Zehnder interferometer. It is shown that the resulting nonlinear index coefficient cannot be correctly described with the usual cubic model. A more convenient theory is developed assuming a medium with two-photon nonlinear absorption and both cubic (n<sub>2sub>) and quintic (n<sub>4sub>) nonlinear index variations. The resulting closed-form expression for the effective nonlinear index coefficient allows to extract the cubic and quintic index coefficients.