Ho-nanoparticle doping for improved high-energy laser fibers

Friebele, E. Joseph, Baker, Colin C., Burdett, Ashley A., Rhonehouse, Daniel L., Bowman, Steven R., Kim, Woohong, Sanghera, Jasbinder S., Kucera, Courtney, Vargas, Amber, Ballato, John, Hemming, Alexander, Simakov, Nikita and Haube, John (2017) Ho-nanoparticle doping for improved high-energy laser fibers. SPIE Photonics West 2017, San Francisco, San Francisco, United States. 27 Jan - 01 Feb 2017. 7 pp . (doi:10.1117/12.2255775).

Abstract

A significant issue for holmium-doped fiber lasers (HoDFLs) operating near 2 μm is multiphonon quenching due to the high phonon energy ~1100 cm^-1 of the silica host, which complicates power scaling due to reduced lifetimes and increased heating. Nanoparticle (NP) doping is a new technique where the structure surrounding the Ho ions is developed chemically prior to doping into the silica core. We have incorporated Ho³⁺ ions into various NPs, such as LaF₃, Al₂O₃ and Lu₂O₃, to shield them from the silica glass matrix. Results indicate slightly longer lifetimes with Ho:LaF₃ NPs and the possibility of further improvement with oxide NPs. We report the first of lasing in a Ho:Lu₂O₃ NP-doped fiber pumped at 1.95 μm and operating at 2.09 μm with a record slope efficiency of 85.2%.

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