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Optics Letters

Optics Letters


  • Vol. 24, Iss. 22 — Nov. 15, 1999
  • pp: 1623–1625

Transient stimulated Raman scattering in gas mixtures

Vitaly Krylov, Ingo Fischer, Victor Bespalov, Dmitry Staselko, and Aleksander Rebane  »View Author Affiliations

Optics Letters, Vol. 24, Issue 22, pp. 1623-1625 (1999)

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We studied, for the first time to our knowledge, transient stimulated Raman scattering in H2– D2 and H2– CH4 gas mixtures excited with 200-fs and 2-ps, 390-nm pulses. Depending on the composition and partial pressure, of those gases, we observed ~40 output lines simultaneously. Under optimum conditions a conversion efficiency of as much as 8% in the combination Raman line at 556 nm was obtained in the H2– CH4 gas mixtures. The difference between picosecond and femtosecond pumping is due to self-phase modulation and to generation of a spectral continuum in the latter. Our calculation of the ratio of the partial pressures is in a good agreement with the experimental results. A new method for measuring the unknown Raman scattering cross section of gas molecules is suggested.

© 1999 Optical Society of America

OCIS Codes
(190.2620) Nonlinear optics : Harmonic generation and mixing
(190.5650) Nonlinear optics : Raman effect
(190.5890) Nonlinear optics : Scattering, stimulated
(190.7110) Nonlinear optics : Ultrafast nonlinear optics

Vitaly Krylov, Ingo Fischer, Victor Bespalov, Dmitry Staselko, and Aleksander Rebane, "Transient stimulated Raman scattering in gas mixtures," Opt. Lett. 24, 1623-1625 (1999)

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