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. 2017 Mar 20;25(6):6725-6731.
doi: 10.1364/OE.25.006725.

Lasing of surface-polished polycrystalline Ho: YAG (yttrium aluminum garnet) fiber

Hyunjun Kim, Randall S Hay, Sean A McDaniel, Gary Cook, Nicholas G Usechak, Augustine M Urbas, Kathleen N Shugart, HeeDong Lee, Ali H Kadhim, Dean P Brown, Benjamin Griffin, Geoff E Fair, Randall G Corns, Santeri A Potticary, Frank K Hopkins, Kent L Averett, David E Zelmon, Triplicane A Parthasarathy, Kristin A Keller
Free article

Lasing of surface-polished polycrystalline Ho: YAG (yttrium aluminum garnet) fiber

Hyunjun Kim et al. Opt Express. .
Free article

Abstract

A polycrystalline 1.5% Ho: YAG fiber with a diameter of 31 µm was prepared. Surface roughness from grain boundary grooving was reduced by polishing, which decreased the fiber scattering coefficient from 76 m-1 to 35 m-1. Lasing tests were done on this fiber with a SF57 Schott glass cladding. Lasing was confirmed by spectrum narrowing with threshold pump power lower than 500 mW and a slope efficiency of 7%. To our knowledge, this is the first lasing demonstration from a small diameter polycrystalline ceramic fiber.

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