Abstract

The successful demonstration of laser oscillation using ZnSe based materials [1] makes it more realistic to expand the optoelectronics into the blue region. To construct the optoelectronics system in blue region, we need efficient nonlinear materials which can work in this wavelength. Recently, we observed a very large third order optical nonlinearity at the exciton resonance in ZnSe films [2]. Ema et al. demonstrated all optical serial to parallel conversion up to sub-Tbit/sec using this material [3]. Thus the ZnSe based materials are strong candidates for the nonlinear optical devices in blue region. To know the dynamics of excitons is essential to examine the applicability of the materials to ultrafast optical devices. In this report, we discuss the dynamics and enhanced nonlinearity of excitons in heteroepitaxial ZnSe thin layers by picosecond and femtosecond time resolved four-wave mixing spectroscopy.

© 1992 Optical Society of America