title: Liquid-crystal lens with a focal length that is variable in a wide range.
abstract: A liquid-crystal (LC) lens driven by two voltages is reported. The lens has a focal length that is electrically tunable. The range of the variable focusing power is very wide, covering approximately 0.8-10.7 D. In the entire focal range the LC lens maintains high optical quality. The LC lens can be driven in a simple way to prevent the occurrence of a disclination line. The use of the LC lens in image formation is demonstrated.
authors.affiliation: Department of Electrical and Electronic Engineering, Akita University, 1-1 Tegatagakuen-cho, Akita 010-8502, Japan. maoye@ipc.akita-u.ac.jp
authors.forename: Mao
authors.initials: M
authors.lastname: Ye
authors.forename: Bin
authors.initials: B
authors.lastname: Wang
authors.forename: Susumu
authors.initials: S
authors.lastname: Sato