A new type of computer-generated hologram (CGH) is described in this research. Upon the base of a two-channel CGH, it can generate four independent images in four different directions with the addition of positive or negative quadratic phase factors on the object spectrum; it has the character of self-focus. Results of the experiment are provided.
© 1997 Optical Society of America
Ren ChaoHong, Zhou Jin, and Gao WenQi, "Four-channel self-focus computer-generated hologram," Appl. Opt. 36, 8844-8847 (1997)