Beam breakup and modulational instability in a bulk type I quadratic medium |
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Authors: | Baboiu D-M Stegeman G I |
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Institution: | 1. Center for Research and Education in Optics and Lasers, University of Central Florida, PO Box 162700, Orlando, Florida, 32816, USA
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Abstract: | The effect of a small modulation superimposed on a strip (1D) solitary wave propagating in a bulk quadratic medium was investigated both analytically and numerically near Type I phase matching. General, exact results were obtained. By using first order perturbation theory, we obtained the gain coefficient for the modulational instability and the modulation cut-off frequency and we investigated their dependence on various beam and material parameters. The wave evolves into a clean periodic sequence of solitary waves and does not reproduce the incident beam. We showed that the beam breakup observed experimentally is due entirely to noise induced modulational instability. |
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