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Proceedings Paper

Investigation of beam quality and gain behavior in a large aperture e-beam controlled CO2 laser
Author(s): Wolfgang Riede; Wilhelm Mayerhofer; Thomas Hall; S. Walther
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Paper Abstract

An investigation of the parameters influencing the small- signal gain and the beam quality of the laser emission from a stable TEM00 cavity within a large aperture e-beam controlled carbon-dioxide laser discharge unit was performed. An almost linear dependency of the small-signal gain as a function of the energy loading was monitored. Small-signal gains of up to 2.4%/cm in the center of the discharge region were found for an energy loading of up to 140 J/(1 bar) at a wavelength of 10.59 micrometer. The beam quality evaluation was done by M2 parameter measurements according to the ISO standard. The fluence distribution was recorded with a beam analyzing system of 100 micrometer spatial resolution. No increase of the M2 parameter was found within the limits of measurement accuracy for a stable resonator configuration when the energy loading almost doubled from 61.7 J/(1 bar) to 112.5 J/(1 bar).

Paper Details

Date Published: 4 April 1997
PDF: 4 pages
Proc. SPIE 3092, XI International Symposium on Gas Flow and Chemical Lasers and High-Power Laser Conference, (4 April 1997); doi: 10.1117/12.270211
Show Author Affiliations
Wolfgang Riede, DLR (Germany)
Wilhelm Mayerhofer, DLR (Germany)
Thomas Hall, DLR (Germany)
S. Walther, DLR (Germany)


Published in SPIE Proceedings Vol. 3092:
XI International Symposium on Gas Flow and Chemical Lasers and High-Power Laser Conference
Denis R. Hall; Howard J. Baker, Editor(s)

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