Four-channel self-focus computer-generated hologram.
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.
Chaohong
R
R
Jin
Z
Z
Wenqi
G
G