ZnSe薄膜的激子光学非线性

EXCITONIC OPTICAL NONLINEARITIES FOR ZnSe THIN FILM

提出了用透射光谱方法测量非线性吸收系数和非线性折射率与波长的关系，理论分析结果表明这两个参数可由线性和非线性透射光谱以及调谐染料激光线型得到．用该方法研究了ＺｎＳｅ薄膜在７７Ｋ和室温两种温度下的光学非线性，得到了这两个温度下的非线性吸收系数和非线性折射率与波长的关系。

We present a simple,but highly sensitive,method for obtaining both the sign and magnitude of the nonlinear refractive index and the nonlinear absorption coefficient as a function of wavelength. It is shown theoretically that these paramters can be easily obtained from the linear and nonlinear thansmission spectra of the medium as well as the laser intensity distribution on the frequancy. This technique is demonstrated for ZnSe thin film at 77K and room temperature.