Illumination system for one-dimensional spatial light modulators employing multiple light sources
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United States of America Patent
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May 20, 2003
Grant Date -
Aug 15, 2002
app pub date -
Feb 12, 2001
filing date -
Feb 12, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention is directed to illuminating a one-dimensional spatial light modulator using an illumination system employing multiple light sources. The illumination system comprises a parallel array of light sources which provides a plurality of light outputs to an optical train. The optical train effectively combines the light sources into a single light source. The single light source provides a single light output for uniformly illuminating the spatial light modulator. The optical train includes a first optical train for receiving the light outputs from each light source, magnifying each light output, and overlaying each of the light outputs to form a single real magnified image. A mode conversion lens receives the single real magnified image, converts a mode profile of the single real magnified image into a top hat mode profile, and outputs a diverging light beam with a top hat mode profile. A second optical train shapes the light beam into an appropriate spatial geometry in such a manner that the light beam effectively illuminates the entire spatial light modulator, and directs the light beam onto the spatial light modulator.
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