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21 August 2009 Laser despeckled image
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Abstract
The objective of this work is the suppression of speckles in an image illuminated by a remote laser. This is accomplished by a novel method in which the illuminating laser beam propagates through a multimode fiber dithered at an arbitrary section, then passes through a microlens array prior to illuminating the image generator. Thereby the speckle contrast is reduced to its minimum value for dithering frequencies of at least 25 Hz, attaining a magnitude speckle contrast of less than 12%, and illumination homogeneity across the illumination filed of less than 20%.
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Michael Tilleman "Laser despeckled image", Proc. SPIE 7429, Novel Optical Systems Design and Optimization XII, 74290I (21 August 2009); https://doi.org/10.1117/12.823902
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