Holographic laser module with dual wavelength for digital versatile disc optical heads

Hsi Fu Shih*, Tzu Ping Yang, Mark O. Freeman, Jinn Kang Wang, Hon Fai Yau, Der-Ray Huang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


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 languageEnglish
Pages (from-to)1750-1754
Number of pages5
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Issue number3 B
StatePublished - 1 Dec 1999


  • Compact disc
  • Compact disc-recordable
  • Digital versatile disc
  • Holographic laser module
  • Holographic optical element
  • Holographic pickup-head module
  • Optical head
  • Pickup head

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