title: 4Pi confocal optical system with phase conjugation.
abstract: We propose a 4Pi confocal system that incorporates a phase-conjugate mirror into the system to solve the alignment problem and automatically correct the spherical aberration associated with the conventional 4Pi confocal system when observing a thick sample. The proposed system is experimentally verified by use of cerium-doped barium titanate crystal as the phase-conjugate mirror. The full width of the central peak is ~0.15 microm. We also theoretically verify the advantage of automatic correction of the spherical aberration by calculating the intensity distribution at the focal spot.
authors.forename: Y
authors.initials: Y
authors.lastname: Kawata
authors.forename: K
authors.initials: K
authors.lastname: Fujita
authors.forename: O
authors.initials: O
authors.lastname: Nakamura
authors.forename: S
authors.initials: S
authors.lastname: Kawata