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Proceedings Paper

Optimum operating conditions of a hollow-cathode Au-II laser
Author(s): L. Szalai; Tadeusz M. Adamowicz; A. Tokarz; G. Bano; K. Kutasi; Z. Donko; Karoly Rozsa
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Paper Abstract

Laser operation on the Au-II 282.3 nm ultraviolet transition was obtained from a high-voltage, segmented hollow-cathode discharge tube. The excitation mechanism of the laser is charge transfer collisions of He+ ions and ground state Au atoms resulting from the sputtering of the gold- coated cathode. The high gain provided by the special hollow cathode construction made it possible to operate the laser with external mirrors on the ultraviolet 282.3 nm line. For the efficient pumping of the laser, high density of both He+ ions and Au atoms must be present in the discharge. Increased cathode sputtering, thus higher Au atom density can be achieved using a small amount of a heavier noble gas (e.g. Ar) in the helium buffer gas. On the other hand, the presence of Ar--due to its low ionization potential and high ionization cross section--reduces the energy of electrons and thus the ionization rate of helium. Measurements of the laser power and small signal gain indicate that the optimum partial pressure of argon is in the order of 0.25 - 0.75%.

Paper Details

Date Published: 19 August 1998
PDF: 4 pages
Proc. SPIE 3573, OPTIKA '98: 5th Congress on Modern Optics, (19 August 1998); doi: 10.1117/12.320953
Show Author Affiliations
L. Szalai, Research Institute for Solid State Physics (Hungary)
Tadeusz M. Adamowicz, Technical Univ. of Warsaw (Poland)
A. Tokarz, Technical Univ. of Warsaw (Poland)
G. Bano, Research Institute for Solid State Physics (Hungary)
K. Kutasi, Research Institute for Solid State Physics (Hungary)
Z. Donko, Research Institute for Solid State Physics (Hungary)
Karoly Rozsa, Research Institute for Solid State Physics (Hungary)

Published in SPIE Proceedings Vol. 3573:
OPTIKA '98: 5th Congress on Modern Optics
Gyorgy Akos; Gabor Lupkovics; Andras Podmaniczky, Editor(s)

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