State Key Laboratory of Transient Optics and Photonics Technology, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, China.
Opt Lett. 2013 Jun 1;38(11):1838-40. doi: 10.1364/OL.38.001838.
A highly efficient pulse cleaner based on nonlinear ellipse rotation (NER) in a liquid medium of CS(2) is investigated for the temporal contrast enhancement of ultrashort pulses. In theory, a nonlinear transmissivity higher than 60% can be achieved with the temporal contrast improved by about four orders of magnitude, on the condition that the extinction ratio of the polarizer-analyzer pair is better than 10(4). In a proof of principle experiment, the cleaned pulses at the mJ level with total transmissivity as high as 30% are obtained via NER, in which the temporal contrast is enhanced by about three orders of magnitude. This provides a simple and feasible technology for improving the temporal contrast of an ultrashort and ultraintense laser system in the future.
基于 CS(2) 液体中的非线性椭圆旋转 (NER) 的高效脉冲清洁器被研究用于增强超短脉冲的时间对比度。从理论上讲，如果偏振器-分析器对的消光比优于 10(4)，则可以实现高于 60%的非线性透过率，并将时间对比度提高约四个数量级。在原理验证实验中，通过 NER 获得了兆瓦级的清洁脉冲，总透过率高达 30%，时间对比度提高了约三个数量级。这为未来提高超短超强激光系统的时间对比度提供了一种简单可行的技术。
