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
G. Vitrant, R. Reinisch, J. C. Paumier, G. Assanto, and G. I. Stegeman, "Nonlinear prism coupling with nonlocality," Opt. Lett. 14, 898-900 (1989)