In this study, the influence of the linear permittivity on the thermally-induced nonlinear optical properties of aluminum-doped zinc oxide thin films was investigated in the visible range, namely at 405, 532, and 650 nm. The strength of the nonlinear response in the films at these wavelengths represented by the thermal nonlinear index of refraction (n2th) and the absorption coefficients (β) magnitudes followed dispersive changes in the films’ permittivity function. These changes were dominantly scattering events within the films, which strongly influenced the nonlinear absorption behavior alternating between saturable absorber and reverse saturable absorber trend. In this research, the results and qualitative description of this relationship are presented.

中文翻译：

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线性介电常数对铝掺杂氧化锌薄膜热致非线性光学特性的影响：可见光范围

在这项研究中，线性介电常数对铝掺杂氧化锌薄膜的热诱导非线性光学特性的影响在可见光范围内进行了研究，即在 405、532 和 650 nm。薄膜在这些波长下非线性响应的强度由热非线性折射率 (n2th) 和吸收系数 (β) 的大小表示，随薄膜介电常数函数的色散变化而变化。这些变化主要是薄膜内的散射事件，强烈影响了可饱和吸收体和反饱和吸收体趋势之间交替的非线性吸收行为。在这项研究中，介绍了这种关系的结果和定性描述。