【摘要】 采用分子系统的多能级结构讨论了有机分子系统非线性折射率随光强变化的规律及其正负变化的条件 ,分析了由非线性折射产生的正透镜效应和负透镜效应的相互转化现象 ,并采用 Z扫描理论加以验证 .更多还原

【Abstract】 The sign change of nonlinear refractive index with irradiance in organic molecular system is discovered based on multi-level rate-equation.The conditions for the change of refractive index between positive and negative is depended on energy-level parameters and conversion phenomena between positive lens effect and negative lens effect caused by nonlinear refraction is interpreted using z-scan theory.更多还原