@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 = {Opt Express},
pages = {38314--38324},
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}
}

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TY  - JOUR
AB  - 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: α-SiO2 > MgO > α-Al2O3 > ZnO > CaF2. However, at an average power of 50 W, MgO performs best, yielding an H5 photon flux of ∼1010 photons/s. The most stable high-power operation was at 20 W, with an H5 and H7 flux of 7.1 × 109 and 5.2 × 108 photons/s, and RMS fluctuations of 0.80% and 1.14%, respectively.
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  - 38324
PY  - 2026///
SP  - 38314
TI  - High-harmonic generation in solids directly driven by a MHz high-power commercial fiber laser.
T2  - Opt Express
UR  - http://dx.doi.org/10.1364/OE.609745
UR  - https://www.ncbi.nlm.nih.gov/pubmed/42839496
VL  - 34
ER  - 

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