Brahms Christian, Austin Dane R, Tani Francesco, Johnson Allan S, Garratt Douglas, Travers John C, Tisch John W G, Russell Philip St J, Marangos Jon P
Opt Lett. 2019 Feb 15;44(4):731-734. doi: 10.1364/OL.44.000731.
Dispersive wave emission (DWE) in gas-filled hollow-core dielectric waveguides is a promising source of tuneable coherent and broadband radiation, but so far the generation of few-femtosecond pulses using this technique has not been demonstrated. Using in-vacuum frequency-resolved optical gating, we directly characterize tuneable 3 fs pulses in the deep ultraviolet generated via DWE. Through numerical simulations, we identify that the use of a pressure gradient in the waveguide is critical for the generation of short pulses.
充气空心介质波导中的色散波发射（DWE）是一种很有前景的可调谐相干宽带辐射源，但迄今为止，尚未证明使用该技术能产生飞秒量级的脉冲。我们利用真空频率分辨光学门控技术，直接对通过色散波发射产生的深紫外波段可调谐3飞秒脉冲进行了表征。通过数值模拟，我们确定在波导中使用压力梯度对产生短脉冲至关重要。
