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Proceedings Paper

Mirror substrates for high-power YAG lasers
Author(s): Rainer G. Schuhmann; Michael Schulz-Grosser; Dieter Froelich
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Paper Abstract

The use of partially transmitting mirrors for high-power laser radiation, especially in laser cavities, requires substrates with very high-quality surfaces to avoid laser damage. The damage can arise from local increase of electro-magnetic field strength and absorption in the thin film coating and in the bounding layer of the substrate material. Therefore, extremely fine polished surfaces are needed. For YAG-laser-application at 1064 nm mostly quartz materials are used which require optimized tooling and techniques for the polishing process. The optimization of this process is achieved by identification and subsequent systematic variation of the main polishing parameters. The resulting surfaces are tested with respect to micro- roughness, light scattering and laser damage threshold both for uncoated and coated substrates. It will be shown that the damage threshold of laser mirrors can be increased by more than 100% compared with conventionally produced surfaces. Extreme threshold values can reach the damage threshold of the pure substrate material.

Paper Details

Date Published: 10 December 1992
PDF: 4 pages
Proc. SPIE 1752, Current Developments in Optical Design and Optical Engineering II, (10 December 1992); doi: 10.1117/12.130738
Show Author Affiliations
Rainer G. Schuhmann, Spindler & Hoyer GmbH & Co. (Germany)
Michael Schulz-Grosser, Spindler & Hoyer GmbH & Co. (Germany)
Dieter Froelich, Spindler & Hoyer GmbH & Co. (Germany)

Published in SPIE Proceedings Vol. 1752:
Current Developments in Optical Design and Optical Engineering II
Robert E. Fischer; Warren J. Smith, Editor(s)

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