title: Noise suppression in coherent imaging.
abstract: Several noise suppression techniques in coherent imaging systems are described. For holographic imaging the diffuse wave, periodic phase modulation, and multiple wave techniques are compared and the implementation of the last is considered. For lens-type imaging systems the use of multiple incoherent waves results in excellent noise suppression.
authors.forename: J
authors.initials: J
authors.lastname: Upatnieks
authors.forename: R W
authors.initials: RW
authors.lastname: Lewis