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Resolution enhancement printing with a variable spot-size laser diode

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Abstract

We demonstrate enhanced resolution printing using a variable spot-size laser diode. The near-field spot size of the laser diode can be changed by controlling the refractive-index distribution in the laser stripe through the injected current. The ratio of the minimum-to-maximum spot size is 2.1:1. This technology provides high-resolution printing without increasing the scanning frequency. Smoother character outlines that consist of finer steps are produced with this laser diode. An effective resolution of 1200 dots/in. (dpi) can be obtained by a printer system with 600-dpi resolution.

© 1997 Optical Society of America

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