title: Four-channel self-focus computer-generated hologram.
abstract: 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.
authors.forename: R
authors.initials: R
authors.lastname: Chaohong
authors.forename: Z
authors.initials: Z
authors.lastname: Jin
authors.forename: G
authors.initials: G
authors.lastname: Wenqi