title: GPC light shaper: static and dynamic experimental demonstrations.
abstract: Generalized Phase Contrast (GPC) is an efficient method for generating speckle-free contiguous optical distributions useful in diverse applications such as static beam shaping, optical manipulation and, recently, for excitation in two-photon optogenetics. GPC allows efficient utilization of typical Gaussian lasers in such applications using binary-only phase modulation. In this work, we experimentally verify previously derived conditions for photon-efficient light shaping with GPC [Opt. Express22(5), 5299 (2014)]. We demonstrate a compact implementation of GPC for creating practical illumination shapes that can find use in light-efficient industrial or commercial applications. Using a dynamic spatial light modulator, we also show simple and efficient beam shaping of reconfigurable shapes geared towards materials processing, biophotonics research and other contemporary applications. Our experiments give ~80% efficiency, ~3x intensity gain, and ~90% energy savings which are in good agreement with previous theoretical estimations.
authors.forename: Andrew
authors.initials: A
authors.lastname: Bañas
authors.forename: Oleksii
authors.initials: O
authors.lastname: Kopylov
authors.forename: Mark
authors.initials: M
authors.lastname: Villangca
authors.forename: Darwin
authors.initials: D
authors.lastname: Palima
authors.forename: Jesper
authors.initials: J
authors.lastname: Glückstad