Kiel 2004 – wissenschaftliches Programm

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K: Kurzzeitphysik

K 5: Poster Kurzzeitphysik

K 5.4: Poster

Mittwoch, 10. März 2004, 17:45–19:45, Foyer

Investigations on Charge Exchange XUV-laser schemes — •V. A. Vorontsov¹, I. F. Shaikhislamov², M. Born¹, B. N. Chichkov³, and B. Wellegehausen¹ — ¹Institut für Quantenoptik, Universität Hannover, Welfengarten 1, 30167 Hannover — ²Institute of Laser Physics, Novosibirsk — ³Laserzentrum Hannover e.V.

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 setup allows to study the process at high densities (above 10¹⁶ cm⁻³) of the particles which is necessary for XUV lasing purposes. Spectra of the plasma and time resolved studies of the emission from specific lines, with and without interacting gas, bear strong evidence for selective charge-exchange pumping. Close to the target, an increase of line intensities from C³⁺(n=3 to n=2) by more than 3 times is observed [1]. Of specific interest is the reaction C⁵⁺+H → C⁵⁺ (n=3) +H⁺. The emission of C⁵⁺ (3p-2s) at 18.2 nm is well known for recombination lasing [2]. Also in this case an enhancement of the line intensity is obtained. Attempts to measure gain by variation of the plasma length will be reported.

[1] V. A. Vorontsov et al., J. Phys. B 36, 3865 (2003)

[2] S. Suckewer et al., Phys. Rev. Lett. 55, 1753 (1985)