Abstract

By using the chelate precursor doping technique, we report on an ytterbium-doped aluminophosphosilicate (APS) large-mode-area fiber with ultralow numerical aperture of 0.036 and effective fundamental mode area of $\sim 550{\mathrm{\mu m}}^2$. With a bend diameter of 600 mm, the bending loss of fundamental mode ${\mathrm{LP}}_{01}$ was measured to be $<{10}^{-3}\mathrm{dB}/\mathrm{m}$, in agreement with the corresponding simulation results, while that of higher order mode ${\mathrm{LP}}_{11}$ is $>100\mathrm{dB}/\mathrm{m}$ at 1080 nm. Measured in an all-fiber oscillator laser cavity, 592 W single-mode laser output was obtained at 1079.64 nm with high-beam quality $M^2$ of 1.12. The results indicate that the chelate precursor doping technique is a competitive method for ultralow numerical aperture fiber fabrication, which is very suitable for developing single-mode seed lasers for high power laser systems.

© 2016 Optical Society of America

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