title: Nonmechanical bifocal zoom telescope.
abstract: We report on a novel zoom lens with no moving parts in the form of a switchable Galilean telescope. This zoom telescope consists of two flat liquid-crystal diffractive lenses with apertures of 10mm that can each take on the focal lengths of -50 and +100cm, with a spacing of 50cm and, hence, a zoom ratio of 4x. The lenses are driven using a low-voltage ac source with 1.6V and exhibit millisecond switching times. The spectral characteristic of this diffractive zoom system is evaluated for light sources of various bandwidths. Potential applications for this technology include a zoom lens with no moving parts for camera phones and medical imaging devices.
authors.affiliation: College of Optical Sciences, University of Arizona, Tucson, Arizona 85721, USA. pouria@u.arizona.edu
authors.forename: Pouria
authors.initials: P
authors.lastname: Valley
authors.forename: Mohammad
authors.initials: M
authors.lastname: Reza Dodge
authors.forename: Jim
authors.initials: J
authors.lastname: Schwiegerling
authors.forename: Gholam
authors.initials: G
authors.lastname: Peyman
authors.forename: N
authors.initials: N
authors.lastname: Peyghambarian