Open AccessBrillouin scattering spectra in high-power single-frequency ytterbium doped fiber amplifiers
Author(s) -
Matthias Hildebrandt,
S. Busche,
P. Weßels,
M. Frede,
Dietmar Kracht
Publication year - 2008
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.16.015970
Subject(s) - brillouin scattering , optics , brillouin zone , amplifier , ytterbium , materials science , scattering , double clad fiber , fiber laser , optical fiber , polarization maintaining optical fiber , physics , optoelectronics , fiber optic sensor , laser , cmos
We report on theoretical and experimental investigations on spontaneous and stimulated Brillouin scattering during operation of a high-power single-frequency polarization-maintaining ytterbium doped fiber amplifier. For different amplifier configurations with co- and counter-propagating seed and pump radiation the evolution of Brillouin scattering spectra was investigated with a heterodyne detection scheme. Spontaneous Brillouin gain spectra at low powers were additionally investigated using a pump-probe technique. The data obtained from these experiments have been compared with a theoretical model based on coupled intensity equations. A Brillouin scattering suppression has been investigated theoretically and experimentally with externally applied temperature gradients along the fiber resulting in up to 3.5 dB suppression and 115 W of amplifier output power.