Engineering of spatial solitons in two-period QPM structures
Abstract
We report on a scheme which might make it practically possible to engineer the effective competing nonlinearities that on average govern the light propagation in quasi-phase-matching (QPM) gratings. Modulation of the QPM period with a second longer period, introduces an extra degree of freedom, which can be used to engineer the effective quadratic and induced cubic nonlinearity. However, in contrast to former work here we use a simple phase-reversal grating for the modulation, which is practically realizable and has already been fabricated. Furthermore, we develop the theory for arbitrary relative lengths of the two periods and we consider the effect on solitons and the bandwidth for their generation. We derive an expression for the bandwidth of multicolor soliton generation in two-period QPM samples and we predict and confirm numerically that the bandwidth is broader in the two-period QPM sample than in homogeneous structures.
Keywords
Cite
@article{arxiv.nlin/0111017,
title = {Engineering of spatial solitons in two-period QPM structures},
author = {Steffen Kjaer Johansen and Silvia Carrasco and Lluis Torner and Ole Bang},
journal= {arXiv preprint arXiv:nlin/0111017},
year = {2009}
}
Comments
V1: 15 pages, 8 figures. V2: Accepted for publication in Optics Communications.16 pages, 10 figures. New soliton content figures, confirming the theoretically predicted peak splitting in 2-period QPM, have been included