气体介质中的细丝化产生可调谐的倍频程中红外脉冲。

Generation of tunable octave-spanning mid-infrared pulses by filamentation in gas media.

机构信息

Department of Chemistry, University of Washington, Seattle, Washington 98195, USA.

出版信息

Opt Lett. 2012 Jun 1;37(11):1787-9. doi: 10.1364/OL.37.001787.

DOI:10.1364/OL.37.001787

Abstract

The continued development of femtosecond mid-infrared (IR) sources with ultrabroad spectral width is critical for probing and controlling complex molecular structural dynamics on an ultrafast timescale. We report on a sub-20 fs, coherent mid-IR source with an octave-spanning spectral bandwidth (>2000 cm(-1)) tunable from 2-8 micrometers (37.5-150 THz), with energy >0.4 μJ/pulse at 1 kHz. The mid-IR pulses are generated by four-wave mixing during the filamentation of intense 800 nm and 400 nm pulses in various gas media. Spectral tunability is achieved by the choice of gas, pressure and input 800 nm pulse energy.

摘要

飞秒中红外（IR）源的持续发展对于在超快时间尺度上探测和控制复杂分子结构动力学至关重要。我们报告了一种具有亚 20fs 相干中红外源，其光谱带宽超过一个倍频程（>2000cm-1），可调谐范围为 2-8 微米（37.5-150THz），在 1kHz 时脉冲能量>0.4μJ/脉冲。中红外脉冲通过在各种气体介质中强 800nm 和 400nm 脉冲的细丝化过程中的四波混频产生。光谱可调谐性通过气体、压力和输入 800nm 脉冲能量的选择来实现。