SBS-suppression in variably strained fibers for fiber-amplifiers and fiber-lasers with a high spectral power density

Engelbrecht, Rainer; Hagen, J.; Schmidt, Matthias

doi:10.1117/12.611234

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Sbs Mitigation1

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Cited by 7 publications

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“…Spontaneously backscattered light is only amplified locally, and there is no accumulated SBS over large distances anymore [30]. This idea was recently used in an Er/Yb amplifier using a staircase strain distribution [31].…”

Section: Sbs Mitigationmentioning

confidence: 99%

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

Lucas¹,

Lombard

Jaouën

et al. 2014

Appl. Opt.

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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=1.21 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.

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Section: Sbs Mitigationmentioning

confidence: 99%