title: Bifocal-polarization holographic lens.
abstract: We present a holographic lens with novel features recorded in an azopolymer film. Two holographic modulations, bulk birefringence and surface relief, are induced in the medium at the same time. The resultant holographic element has two focal planes, and the polarization of light in the focal points depends on the polarization of the incident light. Applications of this device for writing-reading information in two planes simultaneously or separately are described.
authors.affiliation: Central Laboratory of Optical Storage and Processing of Information, Bulgarian Academy of Sciences, P.O. Box 95, 1113 Sofia, Bulgaria.
authors.forename: Geminiano
authors.initials: G
authors.lastname: Martinez-Ponce
authors.forename: Tsveta
authors.initials: T
authors.lastname: Petrova
authors.forename: Natalia
authors.initials: N
authors.lastname: Tomova
authors.forename: Violeta
authors.initials: V
authors.lastname: Dragostinova
authors.forename: Todor
authors.initials: T
authors.lastname: Todorov
authors.forename: Ludmila
authors.initials: L
authors.lastname: Nikolova