Dichromatic cavity solitons

We report the existence of mutually locked stable bright solitons in a plan ar cavity with a quadratic nonlinearity driven at the fundamental frequency . It is shown that these solitons can be considered as residuals of a hexag on pattern in a certain domain of parameter space of the plane wave solutio ns. Moreover, after excitation by a short pulse these solitons persist as i ndividual localized high transmission states. (C) 1999 Elsevier Science Ltd . All rights reserved.