Improvements of optical, mechanical, and geometrical properties of DVD-RAM substrate

Su-dong Moon; Kibyung Seong; Hyun Kim; Shinill Kang; Jun-Seok Lee; Dong Cheol Lee

doi:10.1117/12.416865

7 February 2001 Improvements of optical, mechanical, and geometrical properties of DVD-RAM substrate

Su-dong Moon, Kibyung Seong, Hyun Kim, Shinill Kang, Jun-Seok Lee, Dong Cheol Lee

Proceedings Volume 4085, Fifth International Symposium on Optical Storage (ISOS 2000); (2001) https://doi.org/10.1117/12.416865
Event: Fifth International Symposium on Optical Storage (IS0S 2000), 2000, Shanghai, China

Abstract

It is necessary to improve optical, geometrical, and mechanical properties in the optical disk substrates as the information storage devices with high storage density using short wavelength lasers are being developed. However, the conventional injection molding process is no longer appropriate for producing the high-density information storage optical disk substrates with superb optical, geometrical, and mechanical properties. It is, therefore, inevitable to develop new concepts for the molding processes. In the present study, DVD-RAM substrates were fabricated by injection-compression molding, which is regarded as the most suitable process to manufacture optical disk substrates. The effects of various processing conditions on the birefringence distribution, the land-groove structure including the groove depth and the surface roughness of the land, and the radial tilt were examined experimentally. It was found that the birefringence, which is regarded as one of the most important optical properties for optical disk, was very sensitive to the mold wall temperature history. Also, the integrity of the replication, represented by the land-groove structure, and the radial tilt were influenced mostly by the mold temperature and the compression pressure.

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Su-dong Moon, Kibyung Seong, Hyun Kim, Shinill Kang, Jun-Seok Lee, and Dong Cheol Lee "Improvements of optical, mechanical, and geometrical properties of DVD-RAM substrate", Proc. SPIE 4085, Fifth International Symposium on Optical Storage (ISOS 2000), (7 February 2001); https://doi.org/10.1117/12.416865

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KEYWORDS

Birefringence

Geometrical optics

Optical discs

Data storage

Laser development

Optics manufacturing

Atomic force microscopy

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