Investigation of beam quality and gain behavior in a large aperture e-beam controlled CO2 laser

Wolfgang Riede; Wilhelm Mayerhofer; Thomas Hall; S. Walther

doi:10.1117/12.270211

4 April 1997 Investigation of beam-quality and gain behavior in a large aperture e-beam controlled CO₂ laser

Wolfgang Riede, Wilhelm Mayerhofer, Thomas Hall, S. Walther

Proceedings Volume 3092, XI International Symposium on Gas Flow and Chemical Lasers and High-Power Laser Conference; (1997) https://doi.org/10.1117/12.270211
Event: XI International Symposium on Gas Flow and Chemical Lasers and High Power Laser Conference, 1996, Edinburgh, United Kingdom

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).

Citation Download Citation

Wolfgang Riede, Wilhelm Mayerhofer, Thomas Hall, and S. Walther "Investigation of beam-quality and gain behavior in a large aperture e-beam controlled CO₂ laser", Proc. SPIE 3092, XI International Symposium on Gas Flow and Chemical Lasers and High-Power Laser Conference, (4 April 1997); https://doi.org/10.1117/12.270211

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