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28 August 2002 Influence of electrode material and its surface quality on optical parameters of slab guide laser resonators
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Proceedings Volume 4904, Optical Fiber and Planar Waveguide Technology II; (2002) https://doi.org/10.1117/12.481202
Event: Asia-Pacific Optical and Wireless Communications 2002, 2002, Shanghai, China
Abstract
Results of theoretical and experimental investigation of optical parameters of slab guide resonators used in industrial lasers of the middle IR rang with radio - frequency pumping and output power from 200 W up to 4.5 kW are given. The measurements were carried out with the help of the automated system on the basis of scanning interferometer of the middle IR range supplied by high precision positioning system. Significant (two, three times and more) variation of optical losses in the resonator under small (down to several micrometers) change of its geometry has been found out experimentally. Replacement of a material or use of dielectric covering of the electrode surfaces has been followed not only the change of an average level of optical losses due to complex index of refraction, but also rather complex variation of their dependence on geometry of the resonator. It was shown experimentally that absolute value and character of dependence of optical losses on resonator geometry can change drastically with variation of the roughness of electrode surface. For example nearly smooth surfaces (with a the deepness of the roughness of some nm) are not optimum for minimal optical losses. The best results can be obtained for a structure of a surface of electrodes representing periodic or random structure (depending on electrode material or its dielectric covering ) with depth of around a radiation wavelength.
© (2002) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Vladimir A. Saetchnikov, Elina A. Tcherniavskaia, and Gerhard Schiffner "Influence of electrode material and its surface quality on optical parameters of slab guide laser resonators", Proc. SPIE 4904, Optical Fiber and Planar Waveguide Technology II, (28 August 2002); https://doi.org/10.1117/12.481202
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