Abstract
Different from the cases discussed preciously, nonlinear changes of refractive index in the
photorefractive materials are influenced by both the linear and quadratic electro-optic effect simultaneously
now. Here we present the evolution equations of one-dimension incoherently coupled spatial soliton families
due to two-photon effect in biased photorefractive crystals with both the linear and quadratic electro-optic
effect and discuss their existence conditions and properties in detail. Our analysis indicates that these
soliton families can exist in all three possible realizations: dark-dark, bright-bright and dark-bright
provided that the incident beams have the same polarization, wavelength and are mutually incoherent. Finally,
the stabilities of these soliton families have been discussed by means of beam propagation methods.
© 2014 Chinese Optics Letters
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