Dual wavelength optical head for 0.6 mm and 1.2 mm substrate thicknesses

被引：17

作者：

Katayama, R

Komatsu, Y

Ono, Y

机构：

[1] Optical Recording Technology Development Center, NEC Corporation, Miyamae-ku, Kawasaki 216, 1-1

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS | 1997年 / 36卷 / 1B期

关键词：

optical head; dual wavelength; substrate thickness; holographic optical element; variable magnification;

D O I：

10.1143/JJAP.36.460

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A dual wavelength optical head for 0.6 mm and 1.2 mm substrate thicknesses, containing 635 nm and 785 nm laser diodes, has been developed. Holographic optical element (HOE) type optics and variable magnification type optics are described. For both types of optics, high light power efficiency is obtained, which is suitable for random access memory (RAM) applications. Moreover, the use of 785 nm light makes it possible to read compact disc-recordable (CD-R). A readout operation for a quadruple density CD and a conventional CD has been successfully demonstrated.

引用

页码：460 / 466

页数：7