EVOLUTION OF THE INTENSITY PROFILE OF CERENKOV 2ND-HARMONIC RADIATIONWITH PROPAGATION DISTANCE IN PLANAR WAVE-GUIDES

Using coupled mode theory, we have studied the output intensity profil e of Cerenkov second-harmonic radiation from planar waveguides as a fu nction of the propagation distance, In particular, we have obtained th e variation of the intensity profile taking into account the effect of prism coupling as well as propagation loss, and have shown that the s econd-harmonic radiation evolves into a beam-like output, Results of t he measured intensity profile of the second-harmonic radiation in prot on-exchanged planar waveguides in Z-cut LiNbO3 are also presented that are consistent with the theory.