论文标题
空心毛细管纤维中充满压力梯度的谐振分散波排放
Resonant dispersive wave emission in hollow capillary fibres filled with pressure gradients
论文作者
论文摘要
充满气体的空心波导中的谐振分散波（RDW）发射是一种强大的技术，用于从真空紫外线到近红外产生明亮的几秒激光脉冲。在这里，我们研究了充满纵向气压梯度的空心毛细管纤维中的深脉冲RDW发射。我们通过在气压上应用出令人惊讶的简单缩放规则并使用模拟详细研究依赖能量的分散波谱，从而获得与恒压情况的广泛相似。我们进一步发现，除了使无散递送到实验目标外，降低的梯度还减少了波导本身内部的脉冲拉伸，并且可以使用短波导来产生具有3 fs持续时间的变换限制脉冲。我们的结果阐明了这种频率转换技术的基本动力，并将有助于将其充分利用超快科学及其他方面的应用。
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 fibre 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.
