Optical Review
Print ISSN : 1340-6000
ISSN-L : 1340-6000
Optical Super-Resolution Pickup Using a Liquid Crystal Shutter for CAD-MSR Magnetooptical Disk
Seiji MURATAShigeki HORIYoshihisa SUZUKISatoshi SUMI
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1998 Volume 5 Issue 6 Pages 348-351

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Abstract
We demonstrated characteristics of an optical super-resolution pickup using a liquid crystal (LC) shutter as a shading plate. The problem of laser power loss was solved by an LC shutter which was turned off for writing and turned on for reading. Combining this with CAD-MSR disk, we obtained good signals of high-density recording. This combination increases efficiency of laser power and does not require a slit to eliminate side-lobes. The laser power efficiency for writing is as high as 34% and linear bit density reaches 0.255 mm/bit even with a wavelength of 680 nm and an objective lens NA of 0.60.
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© 1998 by the Optical Society of Japan
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