提高飞秒超强激光脉冲对比度的新方法

文章在简要描述飞秒超强激光脉冲对比度有关概念及其测量方法的基础上，介绍了空间滤波和时间滤波，以及提高注入脉冲种子对比度和强度的技术，环形腔放大技术，光参量啁啾脉冲放大技术（OPCPA），双啁啾脉冲放大技术（DCPA），采用高阶非线性晶体滤波等几种提高对比度的新方法和新技术.采用这些方法和技术，在最近一两年的时间里，人们成功地将多年来徘徊在106量级的飞秒超强激光脉冲对比度，提高到了1011的新水平，从而为强场物理的研究提供了更为理想的光源.

A new method to improve the contrast ratio of fs ultra-intense laser pulses

Based on recent progress in chirped pulse amplification (CPA) techniques, we describe several new methods to improve the contrast ratio of ultra-intense laser pulses, for example by means of spatial filtering, temporal filtering, improving the contrast ratio of the seed, ring-cavity regenerative amplification, optical parametric CPA, double-CPA, and temporal filtering using nonlinear crystals. Through these new techniques the contrast ratio of ultra-intense laser pulses has been successfully increased to 1011.