The characteristics of prism coupling of finite-width beams into nonlinear waveguides composed of media with diffusive nonlinearities (thermal, etc.) are calculated by including a one-dimensional diffusion equation for the nonlocal nonlinearity. The resulting longitudinal feedback leads to bistability, and the threshold value for the minimum diffusion length varies inversely with the angular detuning.
© 1989 Optical Society of America
Original Manuscript: February 21, 1989
Manuscript Accepted: May 23, 1989
Published: August 15, 1989
G. Vitrant, J. C. Paumier, G. Assanto, G. I. Stegeman, and R. Reinisch, "Nonlinear prism coupling with nonlocality," Opt. Lett. 14, 898-900 (1989)