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22 June 2006 Laser diode active height control system for data storage applications
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Proceedings Volume 6282, Optical Data Storage 2006; 62820P (2006)
Event: Optical Data Storage 2006, 2006, Montréal, Canada
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.
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Jen-Yu Fang, Philipp Herget, James A. Bain, and T. E. Schlesinger "Laser diode active height control system for data storage applications", Proc. SPIE 6282, Optical Data Storage 2006, 62820P (22 June 2006);

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