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Q: Quantenoptik
Q 15: Pulserzeugung XUV/EUV/x-ray
Q 15.2: Vortrag
Montag, 24. März 2003, 16:45–17:00, F107
Investigations on Charge Exchange XUV-laser schemes — •V.A. Vorontsov1,2, I.F. Shaikhislamov2, M. Born1, L. Koch1, B.N. Chichkov1, and B. Wellegehausen1 — 1Institut für Quantenoptik, Universität Hannover, Welfengarten 1, D-30167 Hannover, Germany — 2Institute of Laser Physics, pr. Lavrentyeva 13/3, Novosibirsk, 630090 Russia
In the present work charge-exchange pumping as possible mechanism for XUV–lasing is investigated. For basic studies the well-known reaction C4+ + H → C3+ + H+ has been chosen. C4+ ions are produced by fs–laser ablation of a carbon target. The ablation plasma interacts with a pulsed gas jet close to the target. The experimental set up allows to study the process at high densities (above 1016 cm−3) of the particles, which is necessary for XUV lasing purposes. Obtained results bear strong evidence that selective charge-exchange pumping of C3+ ions (n = 3 levels) was indeed observed. The line intensities leading to the emissions from n= 3 to n=2 (31.2 nm, 38.4 nm, 42.0 nm) at distance ≈ 1 mm from the target and density of H2 gas jet above 1016 cm−3 exceed the initial recombination pumping by more than 3 times. Comparison of ns, ps and fs laser pulse ablations shows that the effect of the gas jet is stronger for the shorter pulses. In preliminary experiments with the Al 2O 3 target at the same conditions a dramatic order of magnitude increase in intensity of the 2p-3d (λ=23.8 nm) and 2p2−2p3s (λ=37.4 nm) transitions of O3+ and O2+ ions respectively is observed.