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Applied Optics

Applied Optics


  • Vol. 49, Iss. 7 — Mar. 1, 2010
  • pp: 1104–1115

Nonsinusoidal phase modulations for high-power laser performance control: stimulated Brillouin scattering and FM-to-AM conversion

Steve Hocquet, Denis Penninckx, Jean-François Gleyze, Claude Gouédard, and Yves Jaouën  »View Author Affiliations

Applied Optics, Vol. 49, Issue 7, pp. 1104-1115 (2010)

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High-power lasers, such as the Laser MegaJoule (LMJ), have to be phase modulated to avoid stimulated Brillouin scattering (SBS) that may strongly damage optics at the end of the laser chain. Current spectral broadening on LMJ is performed with a sinusoidal phase modulation. This pure sinusoidal phase modulation leads to inhomogeneous spectral power densities (SPD). Thus, for a same SBS power threshold, the sinusoidal phase-modulated spectrum has to be larger than the equivalent ideal SPD with isoenergetic peaks. We present in this paper a technique to generate energy-balanced Dirac peaks spectra thanks to nonsinusoidal phase modulations. Thus, we can build a narrower spectrum with a nonsinusoidal phase modulation that has the same SBS threshold as a sinusoidal phase modulation, and we show that FM-to-AM conversion can be strongly reduced, which is of great interest for LMJ laser performance, with reductions up to 40%.

© 2010 Optical Society of America

OCIS Codes
(060.5060) Fiber optics and optical communications : Phase modulation
(070.2615) Fourier optics and signal processing : Frequency filtering
(140.3518) Lasers and laser optics : Lasers, frequency modulated

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: October 26, 2009
Revised Manuscript: January 25, 2010
Manuscript Accepted: January 26, 2010
Published: February 23, 2010

Steve Hocquet, Denis Penninckx, Jean-François Gleyze, Claude Gouédard, and Yves Jaouën, "Nonsinusoidal phase modulations for high-power laser performance control: stimulated Brillouin scattering and FM-to-AM conversion," Appl. Opt. 49, 1104-1115 (2010)

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