[PRJ2] Optical Components

[PRJ2-2] Laser Beam Modulation with a Fast Focus Tunable Lens for Speckle Reduction in Laser Projection Displays

Zequn Jian¹, *Zhaomin Tong¹, Yifei Ma¹, Mei Wang¹, Suotang Jia¹, Xuyuan Chen^1,2 (1. Shanxi University (China), 2. University of Southeast Norway (Norway))

キーワード：speckle reduction, focus tunable lens, angular diversity, spatial diversity

We propose a laser speckle reduction method using a fast focus tunable lens (FTL). Different laser beams are generated after modulating the FTL. Thus, when the laser beams are used to illuminate a diffuser, various speckle images are obtained, and the summed speckle images yield a speckle image with reduced speckle contrast ratio.