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Proceedings Paper

Microwave excitation of a XeCl laser without preionization
Author(s): Hans Hermann Klingenberg; Frank Gekat; Gerhard Spindler
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Paper Abstract

Microwave discharges have been used to excite rare gas halide mixtures like XeC1. For the realization of microwave excited excimer lasers a minimum specific pump power density of 100 kW/cxn3 is needed. The resulting power requirements are of the order of one to ten mega- watts. This power has to be deposited in a discharge tube which is housed in a hollow waveguide. For these purposes, a WR-650 waveguide circuit was assembled. The pulsed microwave source was a magnetron transmitter with a frequency of 1.35 GHz, a pulsed power of 2.5 MW and a pulse length of 4 jis. The puise repetition frequency was 10 Hz. A double ridge waveguide coupling structure was designed using the cornputer code URMEL-T. This program is based on a finite difference discretization method for the Maxwell field equations to compute electromagnetic fields in waveguides and cavities. The laser gas mixture consisted of He/Xe/HC1 = 1000/1/0.2 at a total pressure of 1000 mbar. A laser pulse energy of 20 pJ with a pulse width of 65 ns (FWHM) was measured yielding a peak power of 300 W.

Paper Details

Date Published: 1 August 1990
PDF: 8 pages
Proc. SPIE 1278, Excimer Lasers and Applications II, (1 August 1990); doi: 10.1117/12.20601
Show Author Affiliations
Hans Hermann Klingenberg, DLR (Germany)
Frank Gekat, DLR (Germany)
Gerhard Spindler, DLR (Germany)

Published in SPIE Proceedings Vol. 1278:
Excimer Lasers and Applications II
Tommaso Letardi, Editor(s)

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