Title :
Speckle in laser imagery: efficient methods of quantification and minimization
Author :
Martinsen, R.J. ; Kennedy, K. ; Rad, A.
Author_Institution :
Corporation for Laser Opt. Res., Portsmouth, NH, USA
Abstract :
We describe several techniques for the measurement of speckle noise and efficient implementations for its eradication in laser projection displays. A procedure is given for measuring the magnitude of the speckle noise in terms of a “speckle contrast” parameter. Examples are then cited that reveal the relative importance of spatial versus temporal coherence, and how the speckle contrast can approach “acceptable” values with various hardware configurations. The effectiveness of a component to reduce speckle is defined, for practical consideration, in terms of its insertion loss
Keywords :
CCD image sensors; display instrumentation; laser noise; measurement by laser beam; optical projectors; hardware configurations; insertion loss; laser imagery speckle; laser projection displays; minimization; quantification; spatial coherence; speckle contrast; speckle noise magnitude; speckle reduction; temporal coherence; Adaptive optics; Fluctuations; Laser noise; Light sources; Liquid crystal displays; Minimization methods; Noise measurement; Optical noise; Pollution measurement; Speckle;
Conference_Titel :
LEOS '99. IEEE Lasers and Electro-Optics Society 1999 12th Annual Meeting
Conference_Location :
San Francisco, CA
Print_ISBN :
0-7803-5634-9
DOI :
10.1109/LEOS.1999.813629