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Narrowband flat-top Brillouin gain spectrum and low distortion amplification based on pump phase modulation

Published online by Cambridge University Press:  18 July 2013

W. Gao ,
S.N. Liu ,
Y.F. Bi  and
X.B. Hu
W. Gao*
Affiliation:
Department of optics information science and technology, Harbin University of Science and Technology, Harbin, China
S.N. Liu
Affiliation:
Department of optics information science and technology, Harbin University of Science and Technology, Harbin, China
Y.F. Bi
Affiliation:
Department of optics information science and technology, Harbin University of Science and Technology, Harbin, China
X.B. Hu
Affiliation:
Department of optics information science and technology, Harbin University of Science and Technology, Harbin, China
*
Address correspondence and reprint requests to: W. Gao, Department of optics information science and technology, Harbin University of Science and Technology, Harbin, China. E-mail: wei_g@163.com
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Abstract

We theoretically and experimentally investigate the conditions of obtaining a narrowband flat-top Brillouin gain spectrum (BGS) based on single-frequency and multi-frequency phase modulations. Using the unequal-amplitude spectral lines, the flat-top BGS can be realized by controlling the intensity ratio and the frequency separation between them. In experiment, we obtain the flat-top gain spectra with the bandwidths of 40 MHz and 125 MHz, and with the top fluctuation of less than 0.21 dB. Based on this, we also achieve low distortion Brillouin amplification of a probe signal pulse and spectrum.

Keywords

Brillouin gain spectrumLow distortion amplificationPhase modulationStimulated Brillouin scattering
Type
Research Article
Information
Laser and Particle Beams , Volume 31 , Issue 3 , September 2013 , pp. 515 - 521
Copyright
Copyright © Cambridge University Press 2013 

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References

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