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%.
© (2009) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Michael Tilleman "Laser despeckled image", Proc. SPIE 7429, Novel Optical Systems Design and Optimization XII, 74290I (21 August 2009); doi: 10.1117/12.823902; https://doi.org/10.1117/12.823902
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