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Conference on Lasers and Electro-Optics

Stimulated Raman scattering of solid hydrogen in the strong-coupling regime: measurement of the coherence decay time

M. Katsuragawa, J. Z. Li, Masaru Suzuki, K. Hakuta

Published Nov 27, 2002• 0 citations
Publisher

Abstract

Summary form only given.Optical processes with strong coupling and quantum coherence are opening various new possibilities beyond the limit of conventional optical processes. Recently, we have extended these optical processes to a high-density solid medium using solid hydrogen for stimulated Raman scattering (SRS) process. We have found that the strong-coupling in high-density solid-medium results in a new phenomenon of self-induced phase-matching in which the parametric anti-Stokes generation process self-organizes the phase-matching without the strict restriction of the refractive-index dispersion of the medium. In order to assess the mechanism of the self-induced phase-matching, the essential issue should be to measure the coherence decay time for the Raman transition quantitatively. The purpose of this work is to report on this issue using solid hydrogen crystal of nearly pure parahydrogen. The coherence decay for the Raman transition was measured by using time-resolved coherent anti-Stokes Raman scattering.

DOI
10.1109/iqec.1998.680137

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Summary form only given.Optical processes with strong coupling and quantum coherence are opening various new possibilities beyond the limit of conventional optical processes. Recently, we have extended these optical processes to a high-density solid medium using solid hydrogen for stimulated Raman scattering (SRS) process. We have found that the strong-coupling in high-density solid-medium results in a new phenomenon of self-induced phase-matching in which the parametric anti-Stokes generation process self-organizes the phase-matching without the strict restriction of the refractive-index dispersion of the medium. In order to assess the mechanism of the self-induced phase-matching, the essential issue should be to measure the coherence decay time for the Raman transition quantitatively. The purpose of this work is to report on this issue using solid hydrogen crystal of nearly pure parahydrogen. The coherence decay for the Raman transition was measured by using time-resolved coherent anti-Stokes Raman scattering.
We show through experiments of stimulated Raman scattering how solid hydrogen (parahydrogen) can open new perspectives on nonlinear optics. Two phenomena are described: One is the self-induced phase matching in parametric anti-Stokes stimulated Raman scattering (SRS) in which the phase matching is self-organized automatically without the stringent restriction of refractive-index dispersion of the medium, and the other is the extremely slow coherence decay behavior for the Raman transition that may result in the Raman width of 80 kHz full width at half maximum (FWHM).
The purpose of the present paper is to show through experiments of stimulated Raman scattering (SRS) how the solid hydrogen (para-hydrogen) can open new perspectives on laser physics. We discuss the following two topics: one is the self-induced phase-matching in parametric anti-Stokes SRS in which the phase-matching is self-organized automatically without the stringent restriction of refractive-index dispersion of the medium, and the other is the control of the strongly-coupled Raman-coherence using two lasers.
Stimulated Raman scattering (SRS) is experimentally investigated for solid hydrogen in the context of the strong coupling. Coherence decay behaviors are measured for the Raman transition of Q(0)Q(0)Q(0) $(\ensuremath{\nu}=1\ensuremath{-}0)$ using the time-resolved coherent anti-Stokes Raman-scattering method. We show that the coherence decay for the Raman transition changes with the evolution of the SRS from the weak-coupling regime to the strong-coupling regime.
Summary form only given. Optical processes with strong-coupling and quantum-coherence are opening various new possibilities beyond the limit of conventional optical processes. Recently we have extended these optical processes to a condensed phase using solid hydrogen for stimulated Raman scattering (SRS) process. The essence of the work was the self-evolution of the strongly-coupled coherence using one excitation laser. In the present work we extend the above work to a more controllable scheme using two lasers. The point of the present report is the measurement of the SRS characteristics to the two-photon detuning. We show that the parametric SRS processes favorably occurs on the negative detuning side, in which the coherence can be evolved adiabatically to the anti-phased state coherence.