TY - GEN
T1 - Applications of intense ultra-short XUV pulses to solid state physics
T2 - Damage to VUV, EUV, and X-ray Optics
AU - De Grazia, M.
AU - Merdji, H.
AU - Carré, B.
AU - Gaudin, J.
AU - Geoffroy, G.
AU - Guizard, S.
AU - Fedorov, N.
AU - Belsky, A.
AU - Martin, P.
AU - Kirm, M.
AU - Babin, V.
AU - Feldbach, E.
AU - Vielhauer, S.
AU - Nagirnyi, V.
AU - Vassil'Ev, A.
AU - Krejci, F.
AU - Kuba, J.
AU - Chalupsky, J.
AU - Cihelka, J.
AU - Hajkova, V.
AU - Ledinský, M.
AU - Juha, L.
PY - 2007/11/19
Y1 - 2007/11/19
N2 - The new XUV sources, which deliver spatially coherent pulses of high peak power, allow to study elementary processes in the light/solid interaction in the high intensity regime (> 1011 W/cm2). Here, we report two studies which have used high-order laser harmonics (HH) generated in gas as the excitation source. Firstly, we have investigated the dynamics of electron relaxation in the wide gap CdWO4 dielectric crystal, an efficient scintillator material, using time-resolved luminescence spectroscopy. The kinetics decay of luminescence shows evidence of non radiative relaxation of the self-trapped excitons at the μs damage to surfaces of poly(methyl methacrylate) - PMMA, induced by a multi-shot XUV-irradiation (1 kHz reprate) for given fluence, below damage threshold range of ≈ mJ/cm2. The main processes participating in the surface modification, polymer chain scission followed by the blow up of the volatile, molecular fragments and cross-linking in the near-surface layer of remaining material, are tentatively identified and associated to, crater formation for short-time exposure (< 1 min) and surface hardening for long-time exposure (≥ 1 min).
AB - The new XUV sources, which deliver spatially coherent pulses of high peak power, allow to study elementary processes in the light/solid interaction in the high intensity regime (> 1011 W/cm2). Here, we report two studies which have used high-order laser harmonics (HH) generated in gas as the excitation source. Firstly, we have investigated the dynamics of electron relaxation in the wide gap CdWO4 dielectric crystal, an efficient scintillator material, using time-resolved luminescence spectroscopy. The kinetics decay of luminescence shows evidence of non radiative relaxation of the self-trapped excitons at the μs damage to surfaces of poly(methyl methacrylate) - PMMA, induced by a multi-shot XUV-irradiation (1 kHz reprate) for given fluence, below damage threshold range of ≈ mJ/cm2. The main processes participating in the surface modification, polymer chain scission followed by the blow up of the volatile, molecular fragments and cross-linking in the near-surface layer of remaining material, are tentatively identified and associated to, crater formation for short-time exposure (< 1 min) and surface hardening for long-time exposure (≥ 1 min).
KW - Electron relaxation dynamic
KW - High order harmonics
KW - Polymers
KW - Scintillator materials
KW - XUV damage mechanisms
U2 - 10.1117/12.724006
DO - 10.1117/12.724006
M3 - Conference contribution
AN - SCOPUS:36048934630
SN - 0819467146
SN - 9780819467140
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Damage to VUV, EUV, and X-ray Optics
Y2 - 18 April 2007 through 19 April 2007
ER -