title: Differential phase-contrast microscope with a split detector for the readout system of a multilayered optical memory.
abstract: A transmission differential phase-contrast microscope with a split detector is used as a readout system for a multilayered three-dimensional optical memory. The system is applicable to data recorded as refractive-index changes. The system is compact and easy to use. The three-dimensional optical transfer function for the system is derived. This shows that the spatial bandwidth of the system is the same as that of a conventional microscope with incoherent illumination but with much improved contrast. Six layers of information are recorded in a photopolymer and are read out with little cross talk and high contrast.
authors.forename: Y
authors.initials: Y
authors.lastname: Kawata
authors.forename: R
authors.initials: R
authors.lastname: Juškaitis
authors.forename: T
authors.initials: T
authors.lastname: Tanaka
authors.forename: T
authors.initials: T
authors.lastname: Wilson
authors.forename: S
authors.initials: S
authors.lastname: Kawata