10 December 1992 Unstable resonator with semitransparent output coupler for transverse-flow CO2 laser
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Abstract
An unstable resonator with semitransparent output coupler (NRPOZ) and low magnification is investigated theoretically and experimentally for Fresnel numbers 5 - 15 and small signal gain 0.5 - 2.4. With the help of numerical simulation the condition of minimum diffraction losses is found. The beam divergence in the dc-discharge transverse-flow kilowatt-power CO2 laser was approximately two times less in comparison with telescopic unstable resonator without substantial loss of mode volume and output power.
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Pavel Anatolievich Mikheyev, Valeri D. Nikolaev, Alexander Anatolievich Shepelenko, "Unstable resonator with semitransparent output coupler for transverse-flow CO2 laser", Proc. SPIE 1752, Current Developments in Optical Design and Optical Engineering II, (10 December 1992); doi: 10.1117/12.130740; https://doi.org/10.1117/12.130740
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