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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 46, Iss. 22 — Aug. 1, 2007
  • pp: 5516–5521

Efficient Raman laser system using stimulated Brillouin scattering with different confocal parameters for CH4

Young Ho Park, Dong Won Lee, Hong Jin Kong, and YeongSik Kim  »View Author Affiliations

Applied Optics, Vol. 46, Issue 22, pp. 5516-5521 (2007)

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We report the efficient Raman laser system with the wavelength of 1.54   μm from a passively Q-switched Nd:YAG laser with high-pressure methane gas. It has been known that the stimulated Brillouin scattering (SBS) prevents the Raman conversion. The efficiency of the Raman conversion, however, has been greatly enhanced with a specially designed lens to use a backward-stimulated Brillouin in our scheme. The special lens has a focal length of 12 cm, and a maximum conversion efficiency of 51% has been obtained with the first-Stokes energy of 32   mJ and the residual pump energy of 30   mJ at 1400 psi. Comparing two resonators with different focal lengths of the lenses, we have found that backward-SBS can be greatly enhanced by use of the shorter focal length of 12 cm, and the enhanced backward-SBS helps to increase the conversion efficiency.

© 2007 Optical Society of America

OCIS Codes
(140.3550) Lasers and laser optics : Lasers, Raman
(290.5900) Scattering : Scattering, stimulated Brillouin
(290.5910) Scattering : Scattering, stimulated Raman

ToC Category:
Lasers and Laser Optics

Original Manuscript: April 5, 2007
Revised Manuscript: June 6, 2007
Manuscript Accepted: June 8, 2007
Published: July 23, 2007

Young Ho Park, Dong Won Lee, Hong Jin Kong, and YeongSik Kim, "Efficient Raman laser system using stimulated Brillouin scattering with different confocal parameters for CH4," Appl. Opt. 46, 5516-5521 (2007)

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