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Proceedings Paper

Scalability of rf gas discharges for high-power CO2 lasers
Author(s): W. Pfeiffer; K. Breining; R. Paul; Nianle Wu; Adolf Giesen; Helmut Huegel
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Paper Abstract

For the development of compact high-power CO2 lasers high input power densities in discharge tubes with sufficiently large cross sections are required. To achieve a uniform distribution of power deposition into the laser gas flowing in tubes with typically circular cross sections an appropriate electrode shaping is necessary. For this reason, experimental and theoretical investigations have been performed in a wide range of input power, starting from values typical for todays CO2 lasers up to very high levels. Different electrode shapes have been used for optimized stability and homogeneity of the discharge in order to minimize the distortion of the intra-cavity wavefront. The occurrence of filaments limits the range of a stable discharge operation. The homogeneity of the discharge has been assessed by means of spatially resolved small signal gain measurements. Further, the homogeneity of the discharge as a prerequisite for minimal phase distortion has been investigated using an interferometer. A discharge with 17 kW input power at 13.56 MHz in a single tube element is presented showing a flat profile of the small signal gain and a phase distortion of 0.21 micrometers .

Paper Details

Date Published: 16 August 1994
PDF: 11 pages
Proc. SPIE 2206, High-Power Gas and Solid State Lasers, (16 August 1994); doi: 10.1117/12.184573
Show Author Affiliations
W. Pfeiffer, Univ. Stuttgart (Germany)
K. Breining, Univ. Stuttgart (Germany)
R. Paul, Univ. Stuttgart (Germany)
Nianle Wu, Univ. Stuttgart (Germany)
Adolf Giesen, Univ. Stuttgart (Germany)
Helmut Huegel, Univ. Stuttgart (Germany)


Published in SPIE Proceedings Vol. 2206:
High-Power Gas and Solid State Lasers
Markus Bohrer; Tommaso Letardi; Dieter Schuoecker; Horst Weber, Editor(s)

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