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Proceedings Paper

Systematic analysis of nanosecond pulse amplification in Ytterbium-doped double-clad fiber amplifiers by considering inelastic scatterings and different operation regimes
Author(s): M. Abdollahi; M. Bagheri Harouni; M. J. Hekmat; M. Fakhari; N. Shahriari; M. Kanani; H. Normohamadi
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Paper 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.

Paper Details

Date Published: 9 November 2016
PDF: 20 pages
Proc. SPIE 10016, High-Power Lasers and Applications VIII, 100160P (9 November 2016); doi: 10.1117/12.2246497
Show Author Affiliations
M. Abdollahi, Univ. of Isfahan (Iran, Islamic Republic of)
M. Bagheri Harouni, Univ. of Isfahan (Iran, Islamic Republic of)
M. J. Hekmat, Isfahan Univ. of Technology (Iran, Islamic Republic of)
M. Fakhari, Univ. of Kashan (Iran, Islamic Republic of)
N. Shahriari, Isfahan Univ. of Technology (Iran, Islamic Republic of)
M. Kanani, Isfahan Univ. of Technology (Iran, Islamic Republic of)
H. Normohamadi, Isfahan Univ. of Technology (Iran, Islamic Republic of)


Published in SPIE Proceedings Vol. 10016:
High-Power Lasers and Applications VIII
Ruxin Li; Upendra N. Singh; Robert F. Walter, Editor(s)

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