title: An improved low-optical-power variable focus lens with a large aperture.
abstract: We report an improved method of fabricating a variable focus lens in which an in-plane pretension force is applied to a membrane. This method realized a lens with a large optical aperture and high performance in a low-optical-power region. The method was verified by comparing membranes in a simulation using the finite element method. A prototype with a 26 mm-diameter aperture was fabricated, and the wavefront behavior was measured by using a Shack-Hartmann sensor. Thanks to the in-plane pretension force, the lens achieved an infinite focal length with a wavefront error of 105.1 nm root mean square.
authors.forename: Lihui
authors.initials: L
authors.lastname: Wang
authors.forename: Hiromasa
authors.initials: H
authors.lastname: Oku
authors.forename: Masatoshi
authors.initials: M
authors.lastname: Ishikawa