Pan, Jui-Wen Speckle reduction and maintaining contrast in a LASER pico-projector using a vibrating symmetric diffuser. [electronic resource] - Optics express Mar 2014 - 6464-77 p. digital Publication Type: Journal Article; Research Support, Non-U.S. Gov't ISSN: 1094-4087 Standard No.: 10.1364/OE.22.006464 doi