H. Michinel et C. Gomezreino, GAUSSIAN-BEAM PROPAGATION IN PLANAR WAVE-GUIDES WITH GRADED NONLINEARITY, International journal of optoelectronics, 11(2), 1997, pp. 93-99
Gaussian beam propagation in planar ion-exchange waveguides with an in
homogeneous refractive index has been investigated by means of a varia
tional method. Analytical expressions for both the oscillations of the
beam width and the trajectory of the centre of the beam have been der
ived. The solutions obtained yield to a very simple picture of the beh
aviour of gaussian light beams in this kind of media. The comparison w
ith the numerical simulations presented, shows good agreement.