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Use of a beam expanding telescope in a grating-tuned waveguide CO₂ laser

Authors:	M Chapman and N R Heckenberg

Institution:	(1) Department of Physics, University of Queensland, St. Lucia, Queensland, Australia

Abstract:	A Galilean telescope is used as a beam expander in a grating tuned CO₂ waveguide laser to improve line selection while minimizing cavity length to maximise the frequency tuning range. The laser has been used in optoacoustic measurements of saturation of absorption on the transition pumping the 891 m CH₂CF₂ laser.

Keywords:	waveguide laser line tuning absorption saturation
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