Z扫描法中的热致非线性和激发态非线性的数值模拟

本文用速率方程和声光方程从理论上数值模拟了纳秒领域下光学非线性材料在激发态非线性和热致非线性共同作用下的Z扫描曲线,并分析了在不同激光脉冲能量、脉冲宽度下以及在不同的溶液中这两种非线性机制相互竞争对材料的折射性质的影响。数值模拟结果的表明,随着条件的变化,材料的自聚焦或自散焦性质有可能发生转变。

The Numeric Simulation of Thermally Induced Nonlinearity and Excited State Nonlinearity by Z-scan Method

In this paper, we numerically simulate the Z-scan curves of optical nonlinear material based on rate equations and photoacoustie equation in nanosecond regime when both excited state nonlinearity and thermally induced nonlinearity take effect., and analyse the nonlinear refractivity change which is afected by the competition of these two mechanics on different plus energy, plus widths and different solvent. The result of the numerical simulation indicates that it is possible for the optical property to switch between seff-defoeusing and self-focusing when the condition changes.