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Proceedings Paper

Laser diode active height control system for data storage applications
Author(s): Jen-Yu Fang; Philipp Herget; James A. Bain; T. E. Schlesinger
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Paper Abstract

We describe and characterize an active height control system for near-field data storage applications using a commercial laser diode as a direct position sensor. The self-mixing interference signal was experimentally characterized and the effective spot size of the laser sensor was also measured. A control system utilizing interference in the laser as feedback signal was constructed to drive a conventional DVD pickup with the laser sensor mounted. The residual position error is ±9nm when the rotation speed of a glass disk was 1500rpm and the vertical runout was 16μm. The approach limit was estimated to be 25nm when the laser size is reduced to 100μm.

Paper Details

Date Published: 22 June 2006
PDF: 8 pages
Proc. SPIE 6282, Optical Data Storage 2006, 62820P (22 June 2006); doi: 10.1117/12.685215
Show Author Affiliations
Jen-Yu Fang, Carnegie Mellon Univ. (United States)
National Chiao Tung Univ. (Taiwan)
Philipp Herget, IBM Almaden Research Ctr. (United States)
James A. Bain, Carnegie Mellon Univ. (United States)
T. E. Schlesinger, Carnegie Mellon Univ. (United States)

Published in SPIE Proceedings Vol. 6282:
Optical Data Storage 2006
Ryuichi Katayama; Tuviah E. Schlesinger, Editor(s)

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