[OPTICAL REVIEW Vol. 8, No. 4 (2001) 211-213]
Optical Pick-up for Blue Optical Recording at NA = 0.85
Benno H. W. HENDRIKS, Jean SCHLEIPEN*, Sjoerd STALLINGA and Henk van HOUTEN
Philips Research Laboratories, 5656 AA Eindhoven, The Netherlands
(Received February 21, 2001; Accepted April 26, 2001)
Sony and Philips have recently developed the basic technology for a 22.5 GB optical recording system, based on a blue laser (λ= 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.
Key words : optical recording, blue laser diode, high numerical aperture, NA = 0.85, optical pickup unit, beam shaper, laser driver IC