期刊
OPTICS EXPRESS
卷 26, 期 4, 页码 5092-5101出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.26.005092
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- US Army [W911QX-17-C0023]
We report the latest progress in fabrication and laser performance of the fully crystalline double-clad 'Yb: YAG-core/undoped-YAG-clad' fibers grown by the hybrid crystal growth method. The single-crystalline ytterbium (Yb) doped yttrium aluminum garnet (YAG) fiber cores were grown by the laser heated pedestal growth (LHPG) method, and the single-crystalline undoped YAG claddings were grown by the liquid phase epitaxy (LPE) technique, in which the single-crystalline Yb: YAG cores were used as the growth seeds. The key parameters of the hybrid-grown 'crystalline core/crystalline clad' (C4) fibers, including material composition, crystal structure, and fiber propagation loss, were characterized. The results confirmed that the grown C4 fibers, indeed, have both the single-crystalline fiber core and single-crystalline fiber clad. By utilizing a double-clad low-loss C4 fiber as a diodecladding- pumped laser gain medium, we realized a fiber laser with the optical-to-optical conversion efficiency of 68.7% versus the incident pump power. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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