Optical recording elements having recording layers containing cationic azo dyes

摘要

An optical recording element having a transparent substrate and on the surface of the substrate, a recording layer and a light-reflecting layer wherein the recording layer comprises a dye selected from the group consisting of cationic azocyanine dyes and mixtures of such dyes and the unrecorded layer is such that the real part of the refractive index (N) at 780 nm is at least 1.8 and the imaginary part (k) is .01 to 0.15.