Laser and Particle Beams

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Laser and Particle Beams (2009), 27:465-470 Cambridge University Press
Copyright © Cambridge University Press 2009
doi:10.1017/S0263034609990164

Research Article

Characteristics of amplified spectrum of a weak frequency-detuned signal in a Brillouin amplifier


W. Gaoa1a2, Z.W. Lua1 c1, W.M. Hea1, Y.K. Donga1 and W.L.J. Hasia1

a1 Institute of Opto-Electronics, Harbin Institute of Technology, Harbin, China
a2 Department of optics information science and technology, Harbin University of Science and Technology, Harbin, China
Article author query
gao w [Google Scholar]
lu zw [Google Scholar]
he wm [Google Scholar]
dong yk [Google Scholar]
hasi wl [Google Scholar]

Abstract

We will theoretically and experimentally study the effect of the linewidth and the frequency of a weak detuned signal on its amplified spectrum in the Brillouin amplifier. We will show that the spectral profile of the input signal is preserved during amplification only when the signal linewidth is much narrower than the Brillouin linewidth of the amplifier. If the signal linewidth is near or above the Brillouin linewidth, the frequency shift of the amplified signal with respect to the pump will be close to the Brillouin shift of the amplifier, and will be independent of the frequency shift of the input signal.

(Received April 20 2009)

(Accepted May 08 2009)

KeywordsAmplified signal spectrum; Brillouin amplification; Frequency detuning; Stimulated Brillouin scattering

Correspondence:

c1 Address correspondence and reprint requests to: Zhiwei Lu, Institute of Opto-Electronics, Harbin Institute of Technology, P. O. Box 3031. Harbin 150080, China. E-mail: zw_lu@sohu.com