Accession Number : ADA552937


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


Descriptive Note : Technical rept. Mar 2009-Mar 2011


Corporate Author : ARMY RESEARCH LAB ADELPHI MD SENSORS AND ELECTRON DEVICES DIRECTORATE


Personal Author(s) : White, Jeffrey O ; Mungan, Carl E


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a552937.pdf


Report Date : Sep 2011


Pagination or Media Count : 24


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 tilde 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.


Descriptors :   *LASERS , *LIQUID PHASE EPITAXY , COATINGS , EFFICIENCY , EPITAXIAL GROWTH , ERBIUM , GROWTH(GENERAL) , PERFORMANCE(ENGINEERING) , SINGLE CRYSTALS , THRESHOLD EFFECTS , TRANSMITTANCE , YTTRIUM ALUMINUM GARNET


Subject Categories : Electrical and Electronic Equipment
      Crystallography


Distribution Statement : APPROVED FOR PUBLIC RELEASE