GPC-enhanced read-out of holograms.

Mark Jayson Villangca, Andrew Rafael Bañas, Darwin Palima, Jesper Glückstad

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Abstract

The Generalized Phase Contrast (GPC) method has been demonstrated to reshape light efficiently to match the input beam profile requirement of different illumination targets. A spatially coherent beam can be GPC-shaped into a variety of static and dynamic profiles to match e.g. fixed commercially available modulation systems or for more irregular and dynamic shapes such as found in advanced optogenetic light-excitations of neurons. In this work, we integrate a static GPC light shaper to illuminate a phase-only spatial light modulator encoding dynamic phase holograms. The GPC-enhanced phase-holograms are encoded to create reconfigurable spot arrays and arbitrary extended patterns. For a given laser power, our experimental results show a significant intensity gain in the resulting diffraction patterns when we illuminate the holograms with a GPC-shaped beam as compared to the more common practice of hard truncation. The phase flatness of the GPC-enhanced readout beam has also been investigated.
Original languageEnglish
JournalOptics Communications
Volume351
Pages (from-to)121-127
ISSN0030-4018
DOIs
Publication statusPublished - 2015

Keywords

  • Generalized phase contrast
  • Holography
  • Beam shaping
  • Spatial light modulator

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