Ultrafast beam dump materials and mirror coatings tested with the ELI beamlines LIDT test station

0470422 - FZÚ 2017 RIV US eng C - Conference Paper (international conference)
Ďurák, Michal - Kramer, Daniel - Velpula, Praveen K. - Cupal, Josef - Medřík, Tomáš - Hřebíček, Jan - Golasowski, Jiří - Peceli, Davorin - Fekete, Ladislav - Štepán, V. - Kozlová, Michaela - Rus, Bedřich
Ultrafast beam dump materials and mirror coatings tested with the ELI beamlines LIDT test station.
Laser-Induced Damage in Optical Materials. Bellingham: SPIE, 2015 - (Exarhos, G.; Gruzdev, V.; Menapace, J.; Ristau, D.; Soileau, M.), s. 1-12, č. článku 96321B. Proceedings of SPIE, 9632. ISBN 978-162841832-3. ISSN 0277-786X.
[Annual Laser Damage Symposium on Optical Materials for High-Power Lasers /47./. Boulder (US), 27.09.2015-30.09.2015]
R&D Projects: GA MŠMT ED1.1.00/02.0061
Grant - others:ELI Beamlines(XE) CZ.1.05/1.1.00/02.0061
Institutional support: RVO:68378271
Keywords : laser damage * S-on-1 * femtosecond * ultrafast mirror * absorptive coating * vacuum
Subject RIV: BH - Optics, Masers, Lasers

The ELI Beamlines project will deliver ultrafast laser pulses with peak powers up to 10PW available every minute and PW class beams at 10Hz complemented by a 10TW 1kHz beamline. To properly determine damage thresholds of involved optical components in conditions similar to the operational environment and with expected laser parameters, a high vacuum LIDT test station was constructed at PALS facility. Our study presents results of ISO based S-on-1 and R on 1 tests in femtosecond regime (50fs, 800nm, 10Hz/1kHz) performed on two different types of coatings: a) high-absorption black coatings with low outgassing rates, intended for use as a beam dump surface; and b) high-reflectivity, low-dispersion 45° AOI ultrafast mirror coatings. Testing of absorptive coatings was accompanied with QMS residual gas analysis to verify, that high intensity laser radiation approaching the damage threshold does not increase concentration of volatile organic compounds in the vacuum chamber. In case of HR mirror coatings, we also investigate the effect of cleaning on LIDT value, comparing characteristic S-on-1 curves of given sample with values obtained after 12h immersion in ethanol-water solution.
Permanent Link: http://hdl.handle.net/11104/0268066