Microlens Array Homogenizer for Laser Illuminated Projector
Laser light source is a potential illumination light source for non-emissive display applications, especially for liquid crystal projection displays, due to its requirement of low etendue source and highly polarized light. In order to make a conversion from a circular Gaussian beam profile to a rectangular uniform distribution, a microlens array has been proposed as a homogenizer. The analytical and experimental results show that the microlens array with a pitch of 100um under laser beam illumination works as a diffractive element, and a promising uniformity can be obtained with a stack of two microlens array.
Guo Fan JIN, Wing Bun LEE, Chi Fai CHEUNG and Suet TO
C. H. Chen et al., "Microlens Array Homogenizer for Laser Illuminated Projector", Key Engineering Materials, Vols. 364-366, pp. 143-147, 2008