1 May 2014 Pulsed kW-peak power and integrated all fiber MOPA single-frequency source at 2050nm
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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 M2 = 1.2 are achieved with a three stages double clad Tm3+-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 a numerical simulations, the Brillouin gain coefficient around 2 μm in Tm3+ highly doped silica fiber is estimated to 1.2x10-11 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.
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Erik M. D. Lucas, Guillaume Canat, Laurent Lombard, Yves Jaouën, Sylvain Bordais, "Pulsed kW-peak power and integrated all fiber MOPA single-frequency source at 2050nm", Proc. SPIE 9135, Laser Sources and Applications II, 91350M (1 May 2014); doi: 10.1117/12.2052284; https://doi.org/10.1117/12.2052284
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