9 November 2016 Systematic analysis of nanosecond pulse amplification in Ytterbium-doped double-clad fiber amplifiers by considering inelastic scatterings and different operation regimes
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Abstract
By considering propagation equations of Stokes-waves for the Stimulated Brillouin Scattering (SBS) and the Stimulated Raman Scattering (SRS) together with propagation-rate equations of Ytterbium-doped double-clad fiber amplifiers, we numerically solve set of coupled partial differential equations and investigate dynamic characteristics of these amplifiers such as the temporal pulse energy, power, upper-level population distribution, amplified spontaneous emission, stored energy, pulse waveform evolution and the threshold of inelastic scatterings in different regimes of the temporal pulse width, input pulse peak power, input pulse bandwidth and repetition rates. Based on our analysis we establish some criteria for the threshold of inelastic scatterings according to characteristics of the input pulse and amplifying regime. Also for the first time, to the best of our knowledge, we discuss effect of the input pulse shape on the threshold of inelastic scatterings and importance of using pulse shaping methods.
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M. Abdollahi, M. Abdollahi, M. Bagheri Harouni, M. Bagheri Harouni, M. J. Hekmat, M. J. Hekmat, M. Fakhari, M. Fakhari, N. Shahriari, N. Shahriari, M. Kanani, M. Kanani, H. Normohamadi, H. Normohamadi, } "Systematic analysis of nanosecond pulse amplification in Ytterbium-doped double-clad fiber amplifiers by considering inelastic scatterings and different operation regimes", Proc. SPIE 10016, High-Power Lasers and Applications VIII, 100160P (9 November 2016); doi: 10.1117/12.2246497; https://doi.org/10.1117/12.2246497
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