Spectrum evolutions of spontaneous and pump-depleted stimulated Brillouin scatterings in liquid media |
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| Authors: | Gao Wei Lü Zhi-Wei He Wei-Ming Hasi Wu-Li-Ji Zhang Zan |
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| Institution: | Institute of Opto-Electronics, Harbin Institute
of
Technology, Harbin 150001, China; Institute of Opto-Electronics, Harbin Institute
of
Technology, Harbin 150001, China;Department of Applied Physics, Harbin University of
Science and Technology, Harbin 150080, China |
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| Abstract: | A theoretical model for calculating spontaneous and stimulated
Brillouin scattering(SBS) spectra is described. An empirical formula
for the Stokes output spectral linewidth, a function of spontaneous
Brillouin linewidth and the exponential gain coefficient, is
obtained by the calculated data fitting. The formula holds true for
two cases involving pump undepletion and depletion. The lineshape
change from spontaneous to highly pump-depleted SBS spectra is also
investigated. The result shows that for the pump power below the SBS
threshold, the Stokes output spectral lineshape evolves from
Lorentzian to approximately Gaussian as the pump power increases.
For the pump power near or beyond the threshold, the SBS spectrum is
in the form of a steady Gaussian profile, and the spectral linewidth
comes to a certain value about 7 times narrower than the spontaneous
one. The theoretical results are experimentally demonstrated by
using several common liquid media. |
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| Keywords: | Brillouin scattering spectrum
evolution linewidth lineshape |
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