Scientific Results

Origin of backward to forward wave dominance in broadband Raman scattering in hydrogen

Year: 2011

Authors: Marchetti S., Simili R., Gabbanini C.

Autors Affiliation: Istituto Nazionale di Ottica, INO-CNR, U.O.S. Pisa Adriano Gozzini, Via G.Moruzzi 1, 56124 Pisa, Italy

Abstract: We have observed that in a multilens H(2) cell it is possible to obtain a total dominance of the first Stokes backscattered wave with respect to the forward wave [1]. This dominance of the backward wave is produced by a combination of a strong focusing and a matched backward mode stimulated by the forward generation. A quantitative analysis of the backward gain and of the forward gain suppression due to the interference with a matched antiStokes generation is performed. Both the gain and bandwidth analysis are in agreement with a theory of multimode broadband scattering in quasi-stationary regime. A matched backward mode is observed for the pump and its mixing with the first Stokes backward emission induces weak high order backward Raman generations that should be in principle not observable. (C) 2010 Elsevier B.V. All rights reserved.


Volume: 284 (1)      Pages from: 441  to: 445

KeyWords: Raman scattering
DOI: 10.1016/j.optcom.2010.08.032

Citations: 3
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