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Proceedings Paper

Laser texturing processes by reflected light detection
Author(s): Weijie Wang; Yongfeng Lu; Minghui Hong
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Paper Abstract

Laser texturing technique has been established to provide low flying height and low stiction required for manufacturing high storage density media. The characteristics of the laser bumps can be precisely controlled, and are critically important for the excellent tribological performance. In the study, the hard disks have been textured successfully using the argon ion laser with the aid of an acoustic-optic modular in the optical path. Alternative laser bumps can be formed with various bump shape and bump height. The topography of the laser bumps are observed using AFM. Laser bumps are formed because of the modification of laser beam on the substrate during the heating and cooling processes. In attempt to study the bump formation mechanisms, a photodiode was employed to detect the reflected and scattered laser light, which irradiates on the hard disk surface to form laser bumps. The detected signals were studied under various laser power and pulse duration. It was found that there is a good correlation between the detected signal and the laser bump characteristics. The system has been proved to be an effective and convenient method to study the laser bump formation processes, and to in situ diagnose the laser bump characteristics.

Paper Details

Date Published: 15 July 1999
PDF: 8 pages
Proc. SPIE 3618, Laser Applications in Microelectronic and Optoelectronic Manufacturing IV, (15 July 1999); doi: 10.1117/12.352713
Show Author Affiliations
Weijie Wang, National Univ. of Singapore (Singapore)
Yongfeng Lu, National Univ. of Singapore (United States)
Minghui Hong, National Univ. of Singapore (Singapore)

Published in SPIE Proceedings Vol. 3618:
Laser Applications in Microelectronic and Optoelectronic Manufacturing IV
Jan J. Dubowski; Henry Helvajian; Ernst-Wolfgang Kreutz; Koji Sugioka, Editor(s)

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