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

机译:通过气体介质中的丝状化产生可调谐倍频程的中红外脉冲

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摘要

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 (mu)J/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.
机译:飞秒中红外(IR)光源具有超宽光谱宽度的持续发展对于在超快的时间尺度上探测和控制复杂的分子结构动力学至关重要。我们报告了一个低于20 fs的相干中红外源,其跨度为八度,光谱带宽(> 2000 cm〜(-1))可从2-8微米(37.5-150 THz)可调,能量> 0.4(mu 1 kHz时的J /脉冲。在各种气体介质中,在800 nm和400 nm强烈脉冲的细丝化过程中,四波混频产生了中红外脉冲。光谱可调性是通过选择气体,压力和输入的800 nm脉冲能量来实现的。

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