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brillouin gain spectrum

Laser and Particle Beams (1)

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Narrowband flat-top Brillouin gain spectrum and low distortion amplification based on pump phase modulation
W. Gao, S.N. Liu, Y.F. Bi, X.B. Hu
Journal:

Laser and Particle Beams / Volume 31 / Issue 3 / September 2013

Published online by Cambridge University Press:

18 July 2013, pp. 515-521
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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.