New stable servo method for optical disk systems

Chong Sam Chung; Chul Woo Lee; Pyong Yong Seong; Kwung-Hwa Rim; Dong-Ho Shin

doi:10.1117/12.218743

8 September 1995 New stable servo method for optical disk systems

Chong Sam Chung, Chul Woo Lee, Pyong Yong Seong, Kwung-Hwa Rim, Dong-Ho Shin

Proceedings Volume 2514, Optical Data Storage '95; (1995) https://doi.org/10.1117/12.218743
Event: Optical Data Storage '95, 1995, San Diego, CA, United States

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.

Citation Download Citation

Chong Sam Chung, Chul Woo Lee, Pyong Yong Seong, Kwung-Hwa Rim, and Dong-Ho Shin "New stable servo method for optical disk systems", Proc. SPIE 2514, Optical Data Storage '95, (8 September 1995); https://doi.org/10.1117/12.218743

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