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Philosophical Transactions of the Royal Society A Mathematical Physical and Engineering Sciences

Dark–state coherence and stimulated Raman scattering in solid hydrogen

K. Hakuta, M. Katsuragawa, Masaru Suzuki

Published Dec 15, 1997• 7 citations
Publisher

Abstract

We show through the experiments of stimulated Raman scattering in solid hydrogen that a strongly coupled dressed state, dark state, is spontaneously established as the eigenstate of the field–matter interacting system, and that in terms of the parametric anti–Stokes generation process the phase matching is self–induced as a consequence of the establishment of the dark state.

DOI
10.1098/rsta.1997.0139

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We show through the experiments of stimulated Raman scattering in solid hydrogen that a strongly coupled dressed state, dark state, is spontaneously established as the eigenstate of the field–matter interacting system, and that in terms of the parametric anti–Stokes generation process the phase matching is self–induced as a consequence of the establishment of the dark state.
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. There has been increasing interest in optical processes using strong-coupling and induced transparency, termed electromagnetically induced transparency (EIT). Although the idea of EIT started for resonant /spl and/h-scheme (Raman scheme), the idea has now been extended to far-off resonance Raman system. We have reported the spontaneous evolution of strong-coupling through stimulated Raman scattering (SRS) using solid hydrogen. In the present work, we extend the strong-coupling SRS to a more general parametric Raman sideband generation. We show using solid hydrogen as a test medium that, in tile far-off resonance Raman scheme, the strongly-coupled Raman coherence can beat with very broad-band laser radiation and can efficiently copy the broadband nature to Raman sidebands without restriction of the phase-matching, and that this efficient copying occurs on the negative Raman detuning for which the strongly-coupled eigenstate evolves to the anti-phased state (dark state).