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15 February 2012 MEMS focus control and spherical aberration correction for multilayer optical discs
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Proceedings Volume 8252, MOEMS and Miniaturized Systems XI; 82520L (2012)
Event: SPIE MOEMS-MEMS, 2012, San Francisco, California, United States
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.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Sarah J. Lukes and David L. Dickensheets "MEMS focus control and spherical aberration correction for multilayer optical discs", Proc. SPIE 8252, MOEMS and Miniaturized Systems XI, 82520L (15 February 2012);


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