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arXiv:quant-ph/0112093 · Physical Review Letters

Delay-Dependent Amplification of a Probe Pulse via Stimulated Rayleigh Scattering

Mikhail Vladimirovich Fedorov, Sergey V. Popruzhenko, David F. Zaretsky, Wilhelm Becker

Published May 13, 2002• 0 citations
arXivHTMLPDF

Abstract

Stimulated Rayleigh scattering of pump and probe light pulses of close carrier frequencies is considered. A nonzero time delay between the two pulses is shown to give rise to amplification of the delayed (probe) pulse accompanied by attenuation of the pump, both on resonance and off resonance. In either case, phase-matching effects are shown to provide a sufficiently large gain, which can exceed significantly direct one-photon absorption losses.

DOI
10.1103/physrevlett.88.213001

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Stimulated Rayleigh scattering of pump and probe light pulses of close carrier frequencies is considered. A nonzero time delay between the two pulses is shown to give rise to amplification of the delayed (probe) pulse accompanied by attenuation of the pump, both on resonance and off resonance. In either case, phase-matching effects are shown to provide a sufficiently large gain, which can exceed significantly direct one-photon absorption losses.
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A general transient theory of light amplification in absorbing media is developed for small amplification and for small signal. The amplification by stimulated thermal Rayleigh scattering has been studied in detail for various shapes of the laser pulse. A transient gain is predicted when the frequencies of the pump and signal pulse are the same. The dependence of the amplification from the scattering angle was investigated. For narrow angles (Θ < 2 x 10-2 rad) scattering of higher order in angle was calculated. A method of measuring the Rayleigh linewidth with one laser pulse is proposed
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Using well defined input pulses the amplification by stimulated thermal Rayleigh scattering was investigated experimentally as a function of time (within the pulse), of absorption coefficient, and of interaction length. The frequency difference between the two interacting light pulses was varied with an accuracy better than Δν/ν = 10-8. Amplification was measured in the backward direction and at several degrees from the forward direction. The various experimental observations are in good agreement with theory. The possibility of determining material parameters in this amplifier system is discussed
We discuss the maximum achievable time delay of stimulated-Brillouin-scattering-based systems that rely on the superposition of gain and loss spectra. As we will show, the time delay can be enhanced up to 8.5 times if the gain is superimposed with a broad loss and 9.5 times if two narrow losses are superimposed at the wings of the gain. Furthermore, we show that the parametric interaction between the different pump waves is negligibly small. Our theoretical analysis does not include pulse distortions that are accompanied by the delay.