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Proceedings Paper

MEMS focus control and spherical aberration correction for multilayer optical discs
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Paper Abstract

We present the use of a large-stroke deformable membrane mirror at 45° incidence to achieve a very compact optical system capable of fast multi-layer focusing in an optical disc unit. The MEMS mirror replaces a lens translation mechanism and liquid crystal compensator, resulting in a single optical element to control both focus depth and compensation of attendant focus-dependent spherical aberration. We outline the membrane optical requirements in terms of stroke and aberration compensation required for multi-layer focusing for current DVD and BD standards. We demonstrate an adjustable range of at least 1.6 μm peak wavefront spherical aberration correction at a membrane displacement of 7 μm, which should be sufficient capability for quadruple layer BDXL™ discs.

Paper Details

Date Published: 15 February 2012
PDF: 9 pages
Proc. SPIE 8252, MOEMS and Miniaturized Systems XI, 82520L (15 February 2012); doi: 10.1117/12.910632
Show Author Affiliations
Sarah J. Lukes, Montana State Univ. (United States)
David L. Dickensheets, Montana State Univ. (United States)

Published in SPIE Proceedings Vol. 8252:
MOEMS and Miniaturized Systems XI
Harald Schenk; Wibool Piyawattanametha; Wilfried Noell, Editor(s)

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