Abstract

High-power operation of a single-mode, linearly polarized, broadband superfluorescent fiber source has been achieved by using a two-stage cladding-pumped fiber configuration comprising a low power, single-ended, ytterbium-doped superfluorescent fiber seed source and a high-power cladding-pumped, polarization-maintaining, large-mode-area, ytterbium-doped amplifier pumped by a high-power diode source at $976\mathrm{nm}$. The source yielded a maximum linearly polarized output of $106\mathrm{W}$ with a slope efficiency of up to 67% with respect to the launched pump power and with a measured polarization extinction ratio of $13.5\mathrm{dB}$. The wavelength spectrum of the superfluorescent source spanned the range continuously from $\sim 1035$ to $1100\mathrm{nm}$, and the bandwidth (FWHM) of the emission spectrum was $21\mathrm{nm}$. The minimum seed power required for an output power over $100\mathrm{W}$ was only $10\mathrm{mW}$, corresponding to an effective power gain in the amplifier stage of $40\mathrm{dB}$. Single-spatial-mode operation with a beam propagation factor $\left(M^2\right)<1.1$ was achieved by bending the amplifier fiber to a bend radius of $\sim 8\mathrm{cm}$, without a significant reduction in output power.

© 2007 Optical Society of America

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