Abstract

To realize a compact coherent blue light source, second harmonic generation(SHG) in a waveguide has been studied. Quasi-phasematching(QPM) is being investigated intensively among several candidates for phasematching because it gives a higher conversion efficiency using the largest component of the nonlinear susceptibility tensor. QPM requires a periodic modulation of the optical nonlinear coefficient. Such a periodic domain structure can be obtained by alternating the crystal orientation periodically. The conversion efficiency of QPM-SHG depends strongly on the shape of inverted domain structure. An ideal domain structure is a rectangular shape at any depth in the waveguide.

© 1993 Optical Society of America