克尔介质中瞬态热光非线性效应的作用

Transient thermally induced optical nonlinearities in Kerr media

研究了介质中瞬态热光非线性效应对于克尔效应Z扫描测量结果的影响 ,观察到了Z扫描峰谷特性的转变 ,相应的数值模拟结果与实验结果很好地吻合 .实验也发现 ,克尔效应和瞬态热光非线性效应相互抵消时Z扫描曲线呈现出新奇的单峰或平台状曲线 .

We report out experimental results on Z-scan characteristics of co-existence of Kerr effects and transient thermo-optical effects in Kerr media in the nanosecond regime.The transition of peak-valley pattern under a certain condition was observed.There is a basic agreement between experimental data and numerical modeling.Meanwhile, a new single peak pattern or platform pattern of Z-scan curves was observed while the transient thermally induced optical nonlinearity counterbalances with Kerr effects.The research is significant to analyze correctly Z-scan measurements using a nanosecond pulse laser.