New Readout Method Using an Optical System with Differential Numerical Aperture Between Forward and Return Optical Paths

概要

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We have developed a new readout method using an optical system with a differential numerical aperture between forward and return optical paths (i.e., a differential numerical aperture (NA) method). This method realizes jitter merits for larger NA and wide tolerance for smaller NA@. We will show calculated and measured results of jitter and tolerance for a 4.7 GB-digital versatile disk-random access memory (DVD-RAM) disk system due to the differential NA method.
Publication Office, Japanese Journal of Applied Physics, Faculty of Science, University of Tokyoの論文
2001-03-30