Abstract

Second harmonic generation (SHG) in waveguides is being widely studied for the realization of a compact blue source. Obtaining SHG in the Cerenkov configuration [1] has the important advantage of automatically satisfying the ’phase matching condition’. In this paper, using a coupled mode analysis (similar to that in Ref 4) , we obtain an expression for the Cerenkov SHG efficiency, taking into account propagation loss in the waveguide. We have also fabricated planar waveguides in Z-cut LiNbO^ by the proton exchange technique, and have measured the length dependence of the second harmonic power, generated in the Cerenkov configuration. The results of our measurements are in agreement with the theory.

© 1993 Optical Society of America