Low-loss ‘crystalline-core/crystalline-clad’ (C4) fibers for highly power scalable high efficiency fiber lasers

Mark Dubinskii, Jun Zhang, Viktor Fromzel, Youming Chen, Stuart Yin, Claire Luo

Research output: Contribution to journalArticlepeer-review

34 Scopus citations


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 diode-cladding-pumped laser gain medium, we realized a fiber laser with the optical-to-optical conversion efficiency of 68.7% versus the incident pump power.

Original languageEnglish (US)
Pages (from-to)5092-5101
Number of pages10
JournalOptics Express
Issue number4
StatePublished - Feb 19 2018

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics


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