In this section
@article{Donnelly:2026:10.1364/oe.609745,
author = {Donnelly, L and Klee, T and Broughton, JJ and Ferchaud, C and Allegre, H and Tisch, JWG and Matthews, MR},
doi = {10.1364/oe.609745},
journal = {Optics Express},
pages = {38314--38314},
title = {High-harmonic generation in solids directly driven by a MHz high-power commercial fiber laser},
url = {http://dx.doi.org/10.1364/oe.609745},
volume = {34},
year = {2026}
}
TY - JOUR
AB - <jats:p> Solid high-harmonic generation (sHHG) is a compact method for producing deep-ultraviolet and vacuum-ultraviolet (VUV) radiation at wavelengths near or below 200 nm. Generally, sHHG relies on ultrashort laser pulses (10–50 fs) at modest repetition rates (kHz) for sub-10 W average power. Here, we demonstrate VUV generation driven by a 50 W, turnkey, MHz-repetition-rate Yb-fiber laser with a pulse duration of ∼0.5 ps. We investigate the optimum material based on the detected 5th harmonic (H5 = 206 nm) flux with a 1.25 MHz driver, and find the following order: <jats:italic toggle="yes">α</jats:italic> -SiO <jats:sub>2</jats:sub> > MgO > <jats:italic toggle="yes">α</jats:italic> -Al <jats:sub>2</jats:sub> O <jats:sub>3</jats:sub> > ZnO > CaF <jats:sub>2</jats:sub> . However, at an average power of 50 W, MgO performs best, yielding an H5 photon flux of ∼10 <jats:sup>10</jats:sup> photons/s. The most stable high-power operation was at 20 W, with an H5 and H7 flux of 7.1 × 10 <jats:sup>9</jats:sup> and 5.2 × 10 <jats:sup>8</jats:sup> photons/s, and RMS fluctuations of 0.80% and 1.14%, respectively. </jats:p>
AU - Donnelly,L
AU - Klee,T
AU - Broughton,JJ
AU - Ferchaud,C
AU - Allegre,H
AU - Tisch,JWG
AU - Matthews,MR
DO - 10.1364/oe.609745
EP - 38314
PY - 2026///
SP - 38314
TI - High-harmonic generation in solids directly driven by a MHz high-power commercial fiber laser
T2 - Optics Express
UR - http://dx.doi.org/10.1364/oe.609745
UR - https://doi.org/10.1364/oe.609745
VL - 34
ER -