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Laser and Particle Beams

Nonlinear optics in solid hydrogen

M. Katsuragawa, Masaru Suzuki, R.S.D. Sihombing, J. Z. Li, K. Hakuta

Published Dec 1, 1998• 0 citations
Publisher

Abstract

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).

DOI
10.1017/s0263034600011459

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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.
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.
Summary form only given. Recently we have shown using solid hydrogen that stimulated Raman scattering (SRS) can evolve spontaneously from the weak-coupling regime to the strong-coupling regime in which parametric anti-Stokes generation occurs without the restriction of phase-matching. In the present work, we extend this strong-coupling SRS to a more general parametric Raman sideband generation. We show using solid hydrogen as a nonlinear medium that the adiabatically-prepared Raman-coherence can beat with broadband incoherent fluorescence light and efficiently replicate the incoherence nature to the Raman sideband.