Image projector employing a speckle-reducing laser source
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United States of America Patent
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Jul 24, 2012
Grant Date -
Nov 18, 2010
app pub date -
May 15, 2009
filing date -
May 15, 2009
priority date (Note) -
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Abstract
An image projector having one or more broadband lasers designed to reduce the appearance of speckle in the projected image via wavelength diversification. In one embodiment, a broadband laser has an active optical element and a nonlinear optical element, both located inside a laser cavity. The broadband laser generates an output spectrum characterized by a spectral spread of about 10 nm and having a plurality of spectral lines corresponding to different spatial modes of the cavity. Different individual spectral lines effectively produce independent speckle configurations, which become intensity-superimposed in the projected image, thereby causing a corresponding speckle-contrast reduction.
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