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Proceedings Paper

Partial coherent imaging using the Grating Light Valve
Author(s): Ronian H. Siew
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Paper Abstract

In the current state of the prepress industry, high power laser beams (800 nm - 1064 nm, 10 to 40 Watts output) are used to expose Infra-red (IR) sensitized media to create half-tone images. These media are then chemically processed and fed into press systems for printing and publishing. In this paper, the basic physics of a high power IR imaging system recently introduced into the prepress industry is discussed. More specifically, we focus our attention to the spatial light modulator used in the imaging system. This modulator is called the Grating Light ValveTM(GLVTM), invented by David Bloom, and further developed and manufactured by Silicon Light Machines (SLM), Inc. The GLV-imaging system principle is described in terms of basic partial coherence and Fourier optical ideas. Although the fundamental physics of the GLV is based on the coherent superposition of diffracted waves, simple experimental observations imply that a high degree of spatial coherence from the illumination source is not required for the practical application of the GLV technology in imaging systems.

Paper Details

Date Published: 4 June 2002
PDF: 10 pages
Proc. SPIE 4773, Optical Scanning 2002, (4 June 2002); doi: 10.1117/12.469189
Show Author Affiliations
Ronian H. Siew, Agfa Corp. (Singapore)

Published in SPIE Proceedings Vol. 4773:
Optical Scanning 2002
Stephen F. Sagan; Gerald F. Marshall; Leo Beiser, Editor(s)

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