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Design and implementation of a multilaser-based initializer for phase-change optical disks

This paper deals with the opto-mechanical configuration of a newly developed high-speed initializing system for phase change recording media such as CD-RW, DVD-RAM, and DVD-RW. The mechanical layout of the system that ensured the mechanical alignment of each diode laser to be field replaceable. With the unique optical configuration implemented, up to six field- replaceable high-power diode lasers of wavelength 840 nm can be simultaneously installed onto this newly developed system. When all six diode lasers were installed, the internal anamorphic optical system can project the near-field intensity distribution of the high power diode lasers into a large 180 micrometer by 3 micrometer spot size while maintaining enough initialization laser power and providing large depth of focus. In this operational configuration, the system is capable of converting the standard outer diameter of 120 mm phase change optical disk from its originally sputtered amorphous state to initialized crystalline state in less than 20 seconds, which is approximate 2 to 3 times faster than today's commercially available system.