Design of zoom homogenizer to control size of illumination field

Abstract

Abstract. We proposed a zoom homogenizer that can control the size of the illumination field by adding one lens array to the conventional imaging-type beam homogenizer. An equivalent lens system was used to derive the imaging condition and size of the illumination field. The result of the ray-tracing simulation shows the validity of the zoom homogenizer to generate the uniform and sharp-edged beam. We presented the strengths and weaknesses of the zoom homogenizer in terms of its etendue with the maximum acceptance angle of the system. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

An imaging homogenizer for DLP-based 3D printer

“…The non-imaging type consists of a single micro-lens array (MLA) and a condenser lens (CL). It produces a flattop beam with unclear edges 4 . On the other hand, the imaging beam homogenizer has higher uniformity and sharper edges.…”

“…On the other hand, the imaging beam homogenizer has higher uniformity and sharper edges. The imaging type consists of a pair of MLAs and a CL [4][5][6][7] . The Köhler method allows for adjusting both the size and the numerical aperture of the flattop beam.…”

“…The Köhler method allows for adjusting both the size and the numerical aperture of the flattop beam. Another configuration uses an additional MLA for optical zooming of the flattop size, where continuous changes in effective focal length or magnification is enabled while maintaining a constant image distance 4 . Uniform intensity beam profiles can be obtained by using light sources that are either temporally or spatially incoherent 3 .…”