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Physical Review A

Slow light produced by stimulated Raman scattering in solid hydrogen

Jian Liang, M. Katsuragawa, Fam Le Kien, K. Hakuta

Published Feb 7, 2002• 34 citations
Publisher

Abstract

We demonstrate experimentally that far-off-resonance stimulated Raman scattering in solid hydrogen driven by a strong-coupling field allows us to slow down the pulse-peak velocity of the Stokes and anti-Stokes fields to the order of $c/10000.$ We observe the splitting of the temporal profile of the sideband-field pulses into a two-peak structure that is a signature of the separation between the copropagating normal modes.

DOI
10.1103/physreva.65.031801

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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.

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We demonstrate experimentally that far-off-resonance stimulated Raman scattering in solid hydrogen driven by a strong-coupling field allows us to slow down the pulse-peak velocity of the Stokes and anti-Stokes fields to the order of c/10000.c/10000.c/10000. We observe the splitting of the temporal profile of the sideband-field pulses into a two-peak structure that is a signature of the separation between the copropagating normal modes.
The authors survey the theoretical and experimental aspects of generation of slow light in a far-off-resonance Raman medium driven by a strong coupling field. When material dispersion is negligible, the propagation of two coupled sidebands can be described in terms of two normal modes that propagate independently at different group velocities, one at the vacuum speed of light and one at a reduced velocity. They use solid hydrogen as a Raman medium to demonstrate the generation of slow light. The numerical calculations and experimental observations show that, due to high density, narrow Raman width, and small two-photon detuning, far-off-resonance Raman scattering in solid hydrogen can slow down the pulse-peak velocity of the Stokes and anti-Stokes fields to the order of c/10000. This velocity reduction affects the amplitudes of the Stokes and anti-Stokes fields via the beating between the normal modes. The double-peak structure observed in the intensity temporal profiles of the sideband fields is a signature of the splitting of the copropagating normal modes.
Summary form only given. Recently, considerable attention has been drawn to extremely slow light obtained in the conditions of electromagnetically induced transparency. The reason is that slow light may lead to exceptionally large nonlinearities and, in particular, to efficient nonlinear processes at energies of a few photons per atomic cross section. Extremely low group velocities of light have been observed in resonant systems such as a Bose-Einstein condensate of ultracold sodium atoms or hot rubidium vapors. Meanwhile, there is a large number of nonlinear optical techniques based on nonresonant interaction. Therefore, it is desirable to study the possibility of slow light in far-off-resonance media. In the present work, we demonstrate experimentally that far-off-resonance stimulated Raman scattering in solid hydrogen driven by a strong coupling field allows us to slow down the intensity-peak velocity of the Stokes and antiStokes fields.
We study the propagation dynamics of weak Raman sideband fields in a far-off-resonance Raman medium driven by a strong coupling field. We show that the interaction of the system with the strong field, under the conditions of high density, narrow Raman-transition width, and small two-photon detuning, results ina slow group velocity and a substantial enhancement of the injected anti-Stokes sideband field as well as an efficient generation of a Stokes sideband field. We find that the effective group velocity is the same for the two weak fields and is proportional to the field frequency difference instead of the frequency of the corresponding field. We also discuss the condition for exponential growth of the two sideband fields in the medium. We perform numerical calculations for solid hydrogen, a realistic system where the requirements for high density and small Raman width can be met. We demonstrate that the group velocity can be slowed down by several orders, and that the slow light plays a key role for the stimulated Raman scattering process in solid hydrogen.PACS Nos.: 42.50Gy, 42.50Hz, 42.65Ky, 42.79Nv
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.