用于极紫外高阶激光谐波光谱选择的延时补偿单色仪。

Time-delay compensated monochromator for the spectral selection of extreme-ultraviolet high-order laser harmonics.

作者信息

Poletto Luca, Villoresi Paolo, Frassetto Fabio, Calegari Francesca, Ferrari Federico, Lucchini Matteo, Sansone Giuseppe, Nisoli Mauro

机构信息

Laboratory for UV and X-Ray Optical Research, CNR-INFM and Department of Information Engineering, University of Padova, Padova 35131, Italy.

出版信息

Rev Sci Instrum. 2009 Dec;80(12):123109. doi: 10.1063/1.3273964.

DOI:10.1063/1.3273964

PMID:20059133

Abstract

The design and the characterization of a monochromator for the spectral selection of ultrashort high-order laser harmonics in the extreme ultraviolet are presented. The instrument adopts the double-grating configuration to preserve the length of the optical paths of different diffracted rays, without altering the extremely short duration of the pulse. The gratings are used in the off-plane mount to have high efficiency. The performances of the monochromator have been characterized in terms of spectral response, efficiency, photon flux, imaging properties, and temporal response. In particular, the temporal characterization of the harmonic pulses has been obtained using a cross-correlation method: Pulses as short as 8 fs have been measured at the output of the monochromators, confirming the effectiveness of the time-delay compensated configuration.

摘要

本文介绍了一种用于极紫外波段超短高阶激光谐波光谱选择的单色仪的设计与特性。该仪器采用双光栅配置，以保持不同衍射光线的光程长度，同时不改变脉冲的极短持续时间。光栅采用离平面安装方式以实现高效率。该单色仪的性能已通过光谱响应、效率、光子通量、成像特性和时间响应等方面进行了表征。特别是，谐波脉冲的时间特性通过互相关方法获得：在单色仪输出端测量到了短至8飞秒的脉冲，证实了时间延迟补偿配置的有效性。