Abstract
Sony and Philips have recently developed the basic technology for a 22.5 GB optical recording system, based on a blue laser (#x03BB; = 405 nm) and high numerical aperture (NA = 0.85) objective lens. This system is referred to by the acronym DVR (for Digital Video Recording). In this paper we describe the relization of a compact optical pickup unit capable of writing and reading data on disc according to the DVR format.
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