DEPSCOR-92 Ultrafast Pulsed Applications to Photonic Device Materials and MBEGrowth Research

摘要

The research performed centered around the establishment of state of the art timedomain spectroscopy capabilities. This included the upgrade of a femtosecond Ti: sapphire with second harmonic generation to less than 350 nm for studying wide bandgap III-N semiconductors in the ultraviolet spectral range. Probing of the optical properties of III-N structures proceeded, resulting in a significant initial data base for this new material system. In addition, femtosecond four wave mixing signals were observed for the first time in GaN, leading to an understanding of phonon-exciton interactions leading to exciton line broadening. This work led to collaborations with a large group of researchers in the III-N community, and became the basis for expanded funding.