1 May 2017 Optical characterizations on surface-polished polycrystalline YAG fibers
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Abstract
The superior thermal and optical properties of transparent polycrystalline ceramics make them attractive alternatives to glass-based materials for laser gain media. Fibers have other advantages of compactness, vibration-resistance, and reduced cooling requirements. Recently it was found that surface roughness caused by grain boundary grooving dominated optical scattering even though there were other scattering sources in the fiber. Therefore, a lot of effort went to fabrication of fibers with smooth surfaces. A mechanical polishing method for polycrystalline YAG fibers was developed. The fiber surface roughness was reduced, while maintaining a circular cross-section. Surface-polished 1.5% Ho-doped polycrystalline YAG fiber, 62 mm long with 31 μm diameter, was fabricated, and lasing was demonstrated from this fiber. Effects of surface-polishing on the surface roughness and scattering coefficient are presented, and lasing characteristics are discussed.
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Hyunjun Kim, Randall S. Hay, Sean A. McDaniel, Gary Cook, Nicholas G. Usechak, Augustine M. Urbas, HeeDong Lee, Randall G. Corns, Kathleen N. Shugart, Ali H. Kadhim, Dean P. Brown, Benjamin Griffin, "Optical characterizations on surface-polished polycrystalline YAG fibers", Proc. SPIE 10192, Laser Technology for Defense and Security XIII, 101920B (1 May 2017); doi: 10.1117/12.2262673; https://doi.org/10.1117/12.2262673
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