Resonant dispersive wave emission in hollow capillary fibres filled with pressure gradients

Abstract

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.

arXiv comment4 pages, 5 figures

References in corpus (5)

• High-energy pulse self-compression and ultraviolet generation through soliton dynamics in hollow capillary fibres
• Supercontinuum generation in the vacuum ultraviolet through dispersive-wave and soliton-plasma interaction in noble-gas-filled hollow-core photonic crystal fiber
• Generation of micro-J pulses in the deep UV at MHz repetition rates
• Direct characterisation of tuneable few-femtosecond dispersive-wave pulses in the deep UV
• High-energy ultraviolet dispersive-wave emission in compact hollow capillary systems

Cited by in corpus (7)

• Efficient and compact source of tuneable ultrafast deep ultraviolet laser pulses at 50 kHz repetition rate
• Dispersion-tuning of nonlinear optical pulse dynamics in gas-filled hollow capillary fibers
• Timing and energy stability of resonant dispersive wave emission in gas-filled hollow-core waveguides
• Measurements of microjoule-level, few-femtosecond ultraviolet dispersive-wave pulses generated in gas-filled hollow capillary fibers
• Ultrafast circularly polarized pulses tunable from the vacuum to deep ultraviolet
• Robust isolated attosecond pulse generation with self-compressed sub-cycle drivers from hollow capillary fibers
• High-energy tunable ultraviolet pulses generated by optical leaky wave in filamentation