测量光学非线性的4f相位相干成像技术研究进展

Advances in 4f phase coherent imaging technique for measuring the optical nonlinear index

4f相位相干成像技术是一种简单有效的测量材料三阶非线性的方法,文中具体介绍了它的基本原理、发展现状及应用前景。设计了一种改进的4f相位相干成像系统,通过改进传统4f相位相干成像系统的参考光路,使得原来用以监设计测脉冲能量浮动的参考光斑同时具备了监测入射脉冲空间分布的功能,实现了4f相位干成像系统在光斑空间分布不稳定情况下的非线性折射测量。报道了4f相位相干成像技术的最新进展—基于4f相位相干成像系统的泵浦探测系统。用这个新系统进行泵浦-探测实验方便快捷,并可同时研究出材料的激发态吸收与折射。

4f phase coherent imaging technique is a simple and effective technique for measuring the third-order nonlinear index. Its principle,actuality and applications was introduced. An improved 4f phase coherent imaging system was proposed,which improved the reference optical path of traditional the 4f phase coherent imaging system to make the reference plot observing the pulse energy can be used to observe the space distribution of incidence pulse at the same time. By inputting the reference figure,the impact of the instability of the pulse can be avoided. Therefore,the improved 4f phase coherent imaging system can be used to measure the nonlinear index,when the pulses are unstable. The latest progress was also reported-a pump-probe system based on the nonlinear-imaging technique. This new system is helpful to simultaneously measure the dynamic nonlinear absorption and refraction conveniently.