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

机译:1kW峰值功率,2050 nm处110 ns单频掺th光纤放大器

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摘要

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 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 Tm~(3+) highly doped silica fiber is estimated to 1.2 × 10~(-11) m/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.
机译:我们报告了一个高功率,单频率,线性极化的主振荡器功率放大器,在2050 nm处发射110 ns,1 kW峰值功率脉冲。采用三级双包层Tm〜(3+)掺杂光纤架构,可获得20%的斜率效率和M〜2 = 1.21的光束质量。比较了各种泵浦方案,得出的结论是793 nm泵浦波长是2050 nm放大效率最高的。基于数值模拟,Tm〜(3+)高掺杂石英纤维的布里渊增益系数约为2μm,估计为1.2×10〜(-11)m / W。输出峰值功率受激布里渊散射的限制而不受抑制,限制为535 W,沿掺杂光纤施加应变分布则限制为1 kW。

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