Low-cost Engineering of Laser Rods and Slabs with Liquid Phase Epitaxy

Report No. ARL-TR-5741
Authors: Jeffrey O. White and Carl E. Mungan
Date/Pages: September 2011; 24 pages
Abstract: We investigated the use of a liquid phase epitaxial (LPE) coating to improve the performance of a rod or slab laser. A single crystal erbium-doped yttrium aluminum garnet (Er:YAG) rod coated with undoped YAG, and an uncoated sample were procured, then compared on the basis of threshold and slope efficiency measurements. The goal of the testing was to determine the minimum epitaxial thickness necessary to suppress the whispering gallery modes, which otherwise would deplete the gain in ~50% of the rod volume. We also investigated LPE growth on a ceramic sample, because state-of-the-art high power slab lasers are now ceramic. As expected, the sample turned out to be of poor optical quality; no lasing or even transmission measurements could be made.
Distribution: Approved for public release
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Last Update / Reviewed: September 1, 2011