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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Henry van Driel
  • Vol. 29, Iss. 6 — Jun. 1, 2012
  • pp: 1231–1236

Spectral broadening of incoherent nanosecond pulses in a fiber amplifier

Alexey G. Kuznetsov, Evgeniy V. Podivilov, and Sergey A. Babin  »View Author Affiliations


JOSA B, Vol. 29, Issue 6, pp. 1231-1236 (2012)
http://dx.doi.org/10.1364/JOSAB.29.001231


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Abstract

Amplification of incoherent light pulses in a relatively short active fiber is treated. Spectral broadening due to the self-phase modulation effect at negligibly small dispersion has been studied theoretically. The expression for the shape of the output spectrum has been obtained for input pulses of arbitrary temporal and spectral shape at various gain coefficients. The expression is found to be simplified in case of a hyperbolic secant temporal shape. The calculated shapes have been compared with the experimentally measured spectra for Q -switched fiber laser nanosecond pulses amplified in Yb-doped fiber, demonstrating excellent agreement of theory and experiment. The spectrum of the output pulse is shown to be composed of two different-scale structures: a narrow central part copying the initial shape and broad exponential tails that grow with increasing output power.

© 2012 Optical Society of America

OCIS Codes
(140.3540) Lasers and laser optics : Lasers, Q-switched
(190.3270) Nonlinear optics : Kerr effect
(190.4370) Nonlinear optics : Nonlinear optics, fibers
(140.3538) Lasers and laser optics : Lasers, pulsed

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: December 20, 2011
Revised Manuscript: February 7, 2012
Manuscript Accepted: February 8, 2012
Published: May 9, 2012

Citation
Alexey G. Kuznetsov, Evgeniy V. Podivilov, and Sergey A. Babin, "Spectral broadening of incoherent nanosecond pulses in a fiber amplifier," J. Opt. Soc. Am. B 29, 1231-1236 (2012)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-29-6-1231


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