Grating coupling of light pulses into third-order nonlinear waveguides

G. Assanto, M. B. Marques, and G. I. Stegeman

J. Opt. Soc. Am. B 8, 553-561 (1991)


Distributed grating coupling of light pulses into planar waveguides, exhibiting third order nonlinear-optical effects, is studied theoretically. The nonlinear interaction taking place between a beam that is Gaussian in time and space and one or more waveguide media with intensity-dependent refractive indexes or absorptions is analyzed, with emphasis on the different effects that result from the relative importance of two photon absorption, dispersive index changes, and their saturation. Criteria for the evaluation of real and imaginary parts of chi(3) by means of grating coupling are outlined.