Erlangen 2018 – wissenschaftliches Programm
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K: Fachverband Kurzzeit- und angewandte Laserphysik
K 1: Optical Methods - EUV and x-ray Sources
K 1.6: Vortrag
Montag, 5. März 2018, 15:40–15:55, MB HS
Generation of microjoule pulses in the deep ultraviolet at megahertz repetition rates — •Felix Köttig1, Francesco Tani1, Christian Martens Biersach1, John C. Travers1,2, and Philip St.J. Russell1 — 1Max Planck Institute for the Science of Light, Erlangen, Germany — 2School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, UK
Although ultraviolet (UV) light is important in many areas of science and technology, there are very few if any sources capable of delivering wavelength-tunable ultrashort UV pulses at high repetition rates. Dispersive wave (DW) emission from self-compressed solitons in gas-filled hollow-core photonic crystal fiber (PCF) provides a powerful approach, offering simple wavelength-tunability, low requirements on the pump energy and high conversion efficiency. We report the generation of deep UV pulses at megahertz repetition rates and microjoule energies by means of DW emission in gas-filled single-ring hollow-core PCF. Pulses from an ytterbium fiber laser (~300 fs) are first compressed to <25 fs in a single-ring PCF-based nonlinear compression stage and subsequently used to pump a second single-ring PCF stage for broadband DW generation in the deep UV. The UV wavelength is tunable by selecting the gas species and the pressure. Through rigorous optimization of the system, in particular employing a large-core fiber filled with light noble gases, we achieve 1 μJ pulse energies in the deep UV, which is more than 10 times higher, at average powers more than four orders of magnitude greater (reaching 1 W) than previously demonstrated, with only 20 μJ pulses from the pump laser.