Abstract
Backward compatibility with CD-R necessitates having two laser sources in the digital versatile disc (DVD) pickup head. The dual-wavelength optical head complicates pickup design and enlarges the volume of the head. Moreover, it increases the number of components and assembly cost. In this paper, we present a new design for a dual-wavelength holographic pickup-head module. Packaged together in the module are two laser diodes, photodiodes and a holographic optical element (HOE) for diffracting reflected light from the disk onto the corresponding photodetectors. This module can be used as the core of an optical head capable of reading DVD, CD and CD-R.
Original language | English |
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Pages (from-to) | 1750-1754 |
Number of pages | 5 |
Journal | Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers |
Volume | 38 |
Issue number | 3 B |
DOIs | |
State | Published - 1 Dec 1999 |
Keywords
- Compact disc
- Compact disc-recordable
- Digital versatile disc
- Holographic laser module
- Holographic optical element
- Holographic pickup-head module
- Optical head
- Pickup head