GPC-enhanced read-out of holograms

OPTICS COMMUNICATIONS

卷:351

Article

Villangca, Mark¹  Banas, Andrew¹  Palima, Darwin¹  Gluckstad, Jesper¹ 

[1] Tech Univ Denmark, Dept Photon Engn, DTU Foton, DK-2800 Lyngby, Denmark

关键词: Generalized phase contrast;    Holography;    Beam shaping;    Spatial light modulator;   

DOI  :  10.1016/j.optcom.2015.04.057

来源: Elsevier

【 摘 要 】

The Generalized Phase Contrast (GPC) method has been demonstrated to reshape light efficiently to match the input beam profile requirements 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 readbut beam has also been investigated. (C) 2015 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.orgilicenses/by-nc-nd/4.0/).

【 授权许可】

Free