THERMAL AND OPTICAL-PROPERTIES OF METAL AZO DYES FOR DIGITAL VIDEO DISC-RECORDABLE DISCS

The effects of the optical and thermal properties of metal azo dyes on the recording characteristics of digital video disc-recordable (DVD-R ) discs have been studied. A sharp threshold for thermal decomposition of the dye assures a clear mark edge and low jitter for the minimum m ark length of 0.4-044 mu m. A steep absorption edge at the 635 nm side is also critical to high reflectivity and for fabricating clear mark edges. Following these guidelines, excellent 0.4 mu m shortest mark le ngth recording characteristics are achieved with original metal azo dy e.