Abstract.
We present the results of experimental and theoretical studies of fs-pulse Raman-frequency conversion in gases in the regime of medium pumping with pulses shorter than the molecular vibrational period T v. The spectral transformation of both intense excitation pulses and variably delayed injection pulses is analyzed as a function of laser parameters and gas pressure. For intense 40 fs pump pulses propagating in a SF6-filled hollow waveguide, we observed a continuous (pressure-dependent) redshift of the carrier frequency, amounting to several thousand cm−1. By transmitting a weak injection pulse with a narrow spectrum through impulsively excited SF6, we observed multiple Stokes and anti-Stokes lines of the injection radiation corresponding to scattering on the symmetric vibrational mode of SF6. Since the pumping and scattering processes are decoupled in this delayed-pulse scheme, the effect of Kerr self-action on the injection field scattering was completely eliminated. Our physical model of the fs-pulse stimulated Raman scattering is in good quantitative agreement with the observed effects.
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Received: 1 November 1999 / Revised version: 25 March 2000 / Published online: 24 May 2000
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Wittmann, M., Nazarkin, A. & Korn, G. New regime of fs-pulse stimulated Raman scattering . Appl Phys B 70 (Suppl 1), S261–S267 (2000). https://doi.org/10.1007/s003400000330
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DOI: https://doi.org/10.1007/s003400000330