Non-Linear Prism Coupling with Nonlocality

G. Vitrant, R. Reinisch, J. Cl. Paumier, G. Assanto, and G. I. Stegeman

Opt. Lett. 14, 898-890 (1989)


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.