Resonant dispersive wave emission in hollow capillary fibers filled with pressure gradients
Resonant dispersive wave emission in hollow capillary fibers filled with pressure gradients
复制标题
DOI：
10.1364/ol.398343
复制
发表时间：
2020-08-15
期刊：
影响因子：
3.6
通讯作者：
Travers, John C.
中科院分区：
文献类型：
--
作者：
Brahms, Christian;Belli, Federico;Travers, John C.
谐振色散波（RDW）在充气中空波导中发射是一种强大的技术，用于产生从真空紫外到近红外的明亮的几飞秒激光脉冲。在这里，我们研究了深紫外RDW在充满纵向气体压力梯度的中空毛细管纤维中的发射。我们通过应用一个非常简单的气体压力标度规则，得到了与恒压情况大致相似的发射，并通过模拟详细研究了能量依赖的色散波谱。我们进一步发现，除了使实验目标的无色散传输之外，减小的梯度还减少了波导内部的脉冲拉伸，并且使用短波导可以产生持续时间为3fs的变换限制脉冲。我们的研究结果阐明了这种变频技术背后的基本动力学，并将有助于充分利用它在超快科学及其他领域的应用。(C) 2020美国光学学会
Resonant dispersive wave (RDW) emission in gas-filled hollow waveguides is a powerful technique for the generation of bright few-femtosecond laser pulses from the vacuum ultraviolet to the near infrared. Here, we investigate deep-ultraviolet RDW emission in a hollow capillary fiber filled with a longitudinal gas pressure gradient. We obtain broadly similar emission to the constant-pressure case by applying a surprisingly simple scaling rule for the gas pressure and study the energy-dependent dispersive wave spectrum in detail using simulations. We further find that in addition to enabling dispersion-free delivery to experimental targets, a decreasing gradient also reduces the pulse stretching within the waveguide itself, and that transform-limited pulses with 3 fs duration can be generated by using short waveguides. Our results illuminate the fundamental dynamics underlying this frequency conversion technique and will aid in fully exploiting it for applications in ultrafast science and beyond. (C) 2020 Optical Society of America