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Conferences > ODS > 1998 > TuA > TuA.1

Signal Properties of CD, CD-R and CD-RW Compatible DVD-RAM Pickup

Chul Woo Lee, Pyong Yong Seong, Byung Ryul Ryoo, Yong Hoon Lee, Yong Jae Lee, Tae Kyung Kim, Jang Hoon Yoo, Seok Jung Kim, Yong Ki Son, and Dong Ho Shin

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Abstract

We describe techniques that have been used to realize a CD, CD-R and CD-RW compatible DVD-RAM pickup. One objective lens having two aspherical surfaces can be used to read both DVDs and CDs. Chromatic aberration of beam shaping prism which resulted from reading/writing laser power change can be corrected by combining two prisms. And a holographic optical element (HOE) can be used to reduce push-pull tracking offset by detector deviation.

© 1998 Optical Society of America

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