High photon flux table-top coherent extreme ultraviolet source
Abstract
High harmonic generation (HHG) enables extreme ultraviolet radiation with table-top setups. Its exceptional properties, such as coherence and (sub)-femtosecond pulse durations, have led to a diversity of applications. Some of these require a high photon flux and megahertz repetition rates, e.g. to avoid space charge effects in photoelectron spectroscopy. To date this has only been achieved with enhancement cavities. Here, we establish a novel route towards powerful HHG sources. By achieving phase-matched HHG of a megahertz fibre laser we generate a broad plateau (25 eV - 40 eV) of strong harmonics, each containing more than photons/s, which constitutes an increase by more than one order of magnitude in that wavelength range. The strongest harmonic (H25, 30 eV) has an average power of 143 W ( photons/s). This concept will greatly advance and facilitate applications in photoelectron or coincidence spectroscopy, coherent diffractive imaging or (multidimensional) surface science.
Cite
@article{arxiv.1403.4631,
title = {High photon flux table-top coherent extreme ultraviolet source},
author = {Steffen Hädrich and Arno Klenke and Jan Rothhardt and Manuel Krebs and Armin Hoffmann and Oleg Pronin and Vladimir Pervak and Jens Limpert and Andreas Tünnermann},
journal= {arXiv preprint arXiv:1403.4631},
year = {2014}
}