简并泵浦探测法研究非线性吸收的数值讨论

Discussion of different nonlinear absorbtion by nondegenerate pump-probe measurments

非线性吸收是强光与物质作用的一种基本非线性效应,其中材料非共振吸收区的反饱和吸收和双光子吸收由于二者都表现为介质的吸收系数随入射光增强而增强,在一般情况下很难将二者分清。在单重态三能级模型下,通过数值模拟,讨论了利用简并泵浦探测法区分反饱和吸收与双光子吸收的可行性。

Nonlinear absorption is fundamental nonlinear effect between laser and optical material.Reverse saturable absorption and two photon absorption are two kinds of familiar nonlinear absorption and both of them could enhance the absorption.Generally it’s difficult to tell the real nonresonant absorption mechanism(i.e.,in the transparency regime) when they may both happen.This study analysis the possibility to solve this problem with the pump-probe measurement by numerical simulation.