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Proceedings Paper

High-power CO2 laser excited by 2.45 GHz microwave discharges
Author(s): Bernhard Freisinger; Markus Pauls; Johannes Heinrich Schaefer; Juergen Uhlenbusch
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Paper Abstract

Excitation of C02 : N2 : He gas mixtures of a ratio 4.5:13.5:82 by means of microwave discharges (2.45 GHz) leads to powerful laser action. Experiments in systems of axial type with superimposed fast axial flow and the electric field perpendicular to flow and laser beam are performed varying the microwave power, gas pressure, geometry of the waveguide and of the discharge. Calculations of the electrical field inside the waveguide filled with plasma and a dielectric tube using the program URMEL-T are compared with results from invasive probe measurements. It is shown, that by proper tayloring of the electric fields very homogeneous discharges are generated. Laser devices with discharge diameter d = 1.6cm, 2.4cm and 5.1cm are studied both theoretically and experimentally. The best result achieved up to now is a 700 W laser output from one module of length L = 0.3m and diameter d = 5.1cm.

Paper Details

Date Published: 1 February 1991
PDF: 8 pages
Proc. SPIE 1397, 8th Intl Symp on Gas Flow and Chemical Lasers, (1 February 1991); doi: 10.1117/12.25918
Show Author Affiliations
Bernhard Freisinger, Heinrich-Heine-Univ. (Germany)
Markus Pauls, Heinrich-Heine-Univ. (Germany)
Johannes Heinrich Schaefer, Heinrich-Heine-Univ. (Germany)
Juergen Uhlenbusch, Heinrich-Heine-Univ. (Germany)


Published in SPIE Proceedings Vol. 1397:
8th Intl Symp on Gas Flow and Chemical Lasers

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