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A stretchable polymeric membrane shaped diffuser was used to homogenize the coherent laser beam. The developed RGB module was used to focus and defocus test by beam combiners. Average oscillation frequency was set at 180Hz~300Hz and it resulted in the best homogenization effect in visual range. The blue laser module turned out to be the worst case for the transmission and primary reason is believed to be the short length of irradiated laser beam. The developed system removed the speckling and the brightness was decreased by 10 ~ 20% for the RGB laser. Overall the brightness was decreased by 13% and homogenity with respect to the temporal axis was improved from 30fs to 110fs. Key Words : Diffuser, Head up display (HUD), Laser, Speckle patterns, Stretchable polymer * Corresponding Author : Jae-Won Lee(Keimyung Univ.)Tel: +82-10-5000-2381 email: darkjaewon@nate.comReceived September 17, 2013 Revised (1st October 16, 2013, 2nd October 21, 2013) Accepted January 9, 2014

Analysis of Homogenized Laser Beam Display by a Polymeric Stretchable Diffuser