Microlens Array Diffuser with Randomly Distributed Structure Parameters

With regard to optical diffusers, the configuration parameters is determined according to the need of application including beam shape, homogeneity, diffusing angle, transmittance etc. Differentiating with conventional optical diffuser design methods such as diffractive optical element (DOE) methods, we proposed a method to design microlens array (MLA) diffuser configured with random-distributed microlens parameter for generation of a large diffusing angle and uniform intensity distribution. And we discussed the relation between the beam homogeneity and random distribution type of structure parameters. Furthermore, in this article, the author validated that it was possible to splice duplicated small-scale unit into a large-scale diffuser screen with maintaining its scattering properties. (paper)