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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 47, Iss. 22 — Aug. 1, 2008
  • pp: 4045–4054

Blue/DVD/CD compatible optical head

Ryuichi Katayama and Yuichi Komatsu  »View Author Affiliations

Applied Optics, Vol. 47, Issue 22, pp. 4045-4054 (2008)

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Compatibility with Digital Versatile Disc and Compact Disc has been demonstrated for two options of high-density optical disk systems using a blue laser diode. Option 1 (HD DVD) employs a 0.65 numerical aperture objective lens and a 0.6 mm thick protective layer disk, while Option 2 (Blu-ray Disc) employs a 0.85 numerical aperture objective lens and a 0.1 mm thick protective layer disk. An optical head has three laser diodes whose wavelengths are 405 nm , 660 nm , and 785 nm . A spherical aberration caused by the difference in the protective layer thickness of the disk is corrected by an objective lens magnification change, while the numerical aperture of the objective lens is controlled by a wavelength-selective aperture. Experimental results have shown that Option 1 is more preferable, but Option 2 is also acceptable from the viewpoint of the compatibility.

© 2008 Optical Society of America

OCIS Codes
(210.0210) Optical data storage : Optical data storage
(220.0220) Optical design and fabrication : Optical design and fabrication

ToC Category:
Optical Data Storage

Original Manuscript: April 14, 2008
Manuscript Accepted: June 18, 2008
Published: July 24, 2008

Ryuichi Katayama and Yuichi Komatsu, "Blue/DVD/CD compatible optical head," Appl. Opt. 47, 4045-4054 (2008)

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