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Proceedings Paper

New stable servo method for optical disk systems
Author(s): Chong Sam Chung; Chul Woo Lee; Pyong Yong Seong; Kwung-Hwa Rim; Dong-Ho Shin
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Paper Abstract

In an optical pick-up for high areal density recording using Nd:YAG SHG (second harmonic generation) green laser, the stability of a servo mechanism may be deteriorated easily due to many optical elements and long optical path. We propose a new stable servo method employing a differential critical-angle prism. This method showed one order of higher stability than conventional astigmatic servo method to the chief ray tilt. We obtained more than a CNR of 48dB even in case of the large chief ray tilt with 0.5 micrometers mark length on MO recording layer, which is close to the case of no chief ray tilt.

Paper Details

Date Published: 8 September 1995
PDF: 7 pages
Proc. SPIE 2514, Optical Data Storage '95, (8 September 1995); doi: 10.1117/12.218743
Show Author Affiliations
Chong Sam Chung, Samsung Advanced Institute of Technology (South Korea)
Chul Woo Lee, Samsung Advanced Institute of Technology (South Korea)
Pyong Yong Seong, Samsung Advanced Institute of Technology (South Korea)
Kwung-Hwa Rim, Samsung Advanced Institute of Technology (South Korea)
Dong-Ho Shin, Samsung Advanced Institute of Technology (South Korea)


Published in SPIE Proceedings Vol. 2514:
Optical Data Storage '95

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