1  kW peak power, 110  ns single-frequency thulium doped fiber amplifier at 2050  nm

Abstract

We report a high power, single frequency, linearly polarized master oscillator power amplifier emitting 110 ns, 1 kW peak power pulses at 2050 nm. A 20% slope efficiency and a beam quality of $M^2=1.21$ are achieved with three-stage double-clad ${\mathrm{Tm}}^{3+}$-doped fiber architecture. Various pump schemes are compared leading to the conclusion that 793 nm pump wavelength is the most efficient for amplification at 2050 nm. Based on numerical simulations, the Brillouin gain coefficient around 2 μm in ${\mathrm{Tm}}^{3+}$ highly doped silica fiber is estimated to $1.2\times {10}^{-11}\mathrm{m}/\mathrm{W}$. Output peak power is limited by stimulated Brillouin scattering to 535 W without mitigation and to 1 kW with application of a strain distribution along the doped fiber.

© 2014 Optical Society of America

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