Open AccessCascaded harmonic generation from a fiber laser: a milliwatt XUV source
Author(s) -
Antoine Comby,
D. Descamps,
Sandra Beauvarlet,
A. I. Gonzalez,
Florent Guichard,
S. Petit,
Yoann Zaouter,
Y. Mairesse
Publication year - 2019
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.020383
Subject(s) - attosecond , extreme ultraviolet , optics , high harmonic generation , femtosecond , harmonics , fiber laser , laser , physics , optical fiber , ytterbium , optoelectronics , materials science , ultrashort pulse , voltage , quantum mechanics
Recent progresses in femtosecond ytterbium-doped fiber laser technology are opening new perspectives in strong field physics and attosecond science. High-order harmonic generation from these systems is particularly interesting because it provides high flux beams of ultrashort extreme ultraviolet radiation. A great deal of effort has been devoted to optimize the macroscopic generation parameters. Here we investigate the possibility of enhancing the single-atom response by producing high-order harmonics from the second, third and fourth harmonics of a turnkey 50 W, 166 kHz femtosecond Yb-fiber laser providing 135 fs pulses at 1030 nm. We show that the harmonic efficiency is optimal when the process is driven by the third harmonic, producing 6.6 ± 1.3 × 10 14 photons/s at 18 eV in argon, which corresponds to 1.9 ± 0.4 mW average power.