在锰等离子体烧蚀中产生孤立的亚飞秒极紫外脉冲。

Isolated sub-fs XUV pulse generation in Mn plasma ablation.

作者信息

Ganeev R A, Witting T, Hutchison C, Frank F, Tudorovskaya M, Lein M, Okell W A, Zaïr A, Marangos J P, Tisch J W G

机构信息

Blackett Laboratory, Imperial College London, Prince Consort Road, London SW7 2AZ, UK.

出版信息

Opt Express. 2012 Nov 5;20(23):25239-48. doi: 10.1364/OE.20.025239.

DOI:10.1364/OE.20.025239

PMID:23187340

Abstract

We report studies of high-order harmonic generation in laser-produced manganese plasmas using sub-4-fs drive laser pulses. The measured spectra exhibit resonant enhancement of a small spectral region of about 2.5 eV width around the 31st harmonic (~50eV). The intensity contrast relative to the directly adjacent harmonics exceeds one order of magnitude. This finding is in sharp contrast to the results reported previously for multi-cycle laser pulses [Physical Review A 76, 023831 (2007)]. Theoretical modelling suggests that the enhanced harmonic emission forms an isolated sub-femtosecond pulse.

摘要

我们报告了使用亚4飞秒驱动激光脉冲对激光产生的锰等离子体中的高次谐波产生进行的研究。测量光谱显示在第31次谐波（约50电子伏特）附近约2.5电子伏特宽度的小光谱区域有共振增强。相对于直接相邻谐波的强度对比度超过一个数量级。这一发现与先前报道的多周期激光脉冲的结果[《物理评论A》76, 023831 (2007)]形成鲜明对比。理论建模表明，增强的谐波发射形成一个孤立的亚飞秒脉冲。