Accession Number : ADP006410

Title :   Pregrooving on Glass Disks by the Sol-Gel Method. Part 1. Formation and Evaluation of Pregrooved Glass Disks,

Corporate Author : OSAKA PREFECTURE UNIV (JAPAN) DEPT OF APPLIED CHEMISTRY

Personal Author(s) : Matsuda, Atsunorl ; Matsuno, Yoshihiro ; Kataoka, Shigeyuki ; Katayama, Shinya ; Tsuno, Toshio

Report Date : MAR 1992

Pagination or Media Count : 9

Abstract : Pregrooved glass disks were prepared by the application of the sol-gel coating technique; the soda-lime-silica glass disks were coated with polyethylene glycol(PEG)-containing SiO2-TiO2 gel films, in which fine patterns were formed by pressing a stamper. The refractive index of the pregrooved layer was matched with that of the glass disks by adjusting the TiO2 content. When the weight ratio of PEG with the average molecular weight of 600 to SiO2-TiO2) oxides was unity, the pitch of the pregrooves formed was unchanged in comparison with that of the stamper used after the heat-treatment at 350 deg C, while the land height and the land width of the pregrooves were respectively reduced to 60% and 85% of those of the stamper after the heat-treatment. The noise level of the glass disks with the pregrooved SiO2-TiO2 layer was lower by 1-2 dB than that of the disks with pure SiO2 layer in the frequency range from 0.5 to 2.0 MHz. The lower noise level of the former can be ascribed to the agreement in the refractive index between the pregrooved layer and the glass disks.

Descriptors :   *GELS, *GLASS, *SILICA GLASS, *OPTICS, AGREEMENTS, CALCIUM OXIDES, COATINGS, COMPARISON, DISKS, FILMS, FINES, FREQUENCY, HEAT, HEAT TREATMENT, HEIGHT, INDEXES, LAYERS, MOLECULAR WEIGHT, NOISE, OXIDES, PATTERNS, POLYETHYLENE, RATIOS, REFRACTIVE INDEX, WEIGHT, WIDTH.

Subject Categories : Optics
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE