Novel compact beam expanders that could be useful for applications such as providing light to flat panel displays are presented. They are based on a planar configuration in which three spatially linear gratings are recorded on one transparent substrate, so as to expand a narrow incoming beam in two dimensions. We present the design and recording procedures along with results, showing a relatively uniform intensity of the wide output beam. Such expanders can serve for illuminating flat panel displays.
© 2002 Optical Society of America
Revital Shechter, Yaakov Amitai, and Asher A. Friesem, "Compact Beam Expander with Linear Gratings," Appl. Opt. 41, 1236-1240 (2002)