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

Optics Express
M DubinskiiClaire Luo

Abstract

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.

References

Nov 13, 2012·Applied Optics·Sylvia JetschkeJohannes Kirchhof
May 4, 2016·Optics Express·Yuan LiRamesh Shori

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Citations

May 3, 2018·Optics Express·Benoît BoulangerTakunori Taira
May 15, 2020·Optics Express·Viktor FromzelMark Dubinskii
Dec 28, 2019·Optics Express·Shicheng ZhuXiuquan Ma

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