Use of 3-hydroxy-cyclohex-2-enone azo based dyes in optical layers

摘要

The present invention relates to the use of 3-hydroxy-cyclohex-2-enone azo based dyes and/or of azo metal complex dyes made thereof in optical layers for optical data recording, preferably for optical data recording using a laser with a wavelength up to 450 run. The invention further relates to a write once read many (WORM) type optical data recording medium capable of recording and reproducing information with radiation of blue laser, which employs a 3-hydroxy-cyclohex-2-enone azo based dye and/or an azo metal complex dye made thereof in the optical layer.