Abstract
Recent technological developments for CD and DVD optical heads are described. Optical heads play a key role in supporting optical disks, for which a large market has been formed. To evolve optical disks from playing only into recordable ones with a higher density and a larger capacity, high-power, high-resolution optical heads have been developed. The advent of a higher-performance optical head largely depends on the development of laser diode technology, as well as on the development of optical technology.
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