Semi-insulating and conducting SiC crystalline transparent substrates were studied after being processed by
femtosecond laser radiation (780nm at 160fs). Z-scan and damage threshold experiments were performed on both SiC
bulk materials to determine each samples' nonlinear and threshold parameters. "Damage" in this text refers to an index
of refraction modification as observed visually under an optical microscope. In addition, a study was performed to
understand the damage threshold as a function of numerical aperture. Presented here for the first time, to the best of our
knowledge, is the damage threshold, nonlinear index of refraction, and nonlinear absorption measured values.
Organic materials exhibiting strong two-photon absorption cross-sections and subsequent up-converted fluorescence have been targeted for use in a variety of applications including optical data storage, nondestructive imaging, frequency up-converted lasing, and microfabrication. In order for these materials to be useful in practical application they must either be coupled with a liquid solvent or doped into a solid host material. The purpose of this study is to examine effects of different host environments on the nonlinear photophysical properties of AF-455, a recently developed organic two-photon absorber. We present results of experiments using both emission and absorption methods to characterize the linear and nonlinear response of AF-455 dissolved in solvents of varying polarity and doped in a polymer (PMMA) matrix.