Digital holography for 3D imaging and display in the IR range: Challenges and opportunities
Authors: Pelagotti A., Paturzo M., Geltrude A., Locatelli M., Meucci R., Poggi P., Ferraro P.
Autors Affiliation: CNR-INO (National Institute of Opticts), L.go E. Fermi 6, 50125 Florence, Italy; CNR-INO (National Institute of Opticts), via Campi Flegrei 34, 80078 Pozzuoli, Italy
Abstract: In analog holography, the infrared (IR) range received quite some attention, since it could provide interesting information, not achievable otherwise. Since digital sensors in this band became recently available and affordable, also digital holography (DH) expanded its feasibility beyond the visible wavelengths. In fact, the IR range allows shorter recording distances, unparalleled larger field of view and less stringent requirements on system stability, together with some specific characteristics, like e. g. the possibility to test IR glasses or other materials transparent to IR radiation, which cannot be controlled in visible range. In this paper we review the activities which took place in this field and illustrate the results achieved, referring to the opportunities this technique offers, and the challenges it presents. We show efficient reconstructions of holograms of objects of various materials, recorded with different resolution digital thermal cameras, in various configurations, and moreover we demonstrate optical holographic display through a liquid crystal based Spatial Light Modulator which gives the chance to get direct 3D imaging and display of long IR range. Moreover we believe this opens the route toward holography in THz region.
Journal/Review: 3D RESEARCH
Volume: 1 (4) Pages from: 1 to: 10
More Information: The research leading to these results has received funding from the European Community\’s Seventh Framework Programme FP7/2007-2013 under grant agreement n degrees 216105 (\”Real 3D\” Project).KeyWords: 3D imaging and display; Different resolutions; Digital holography; Digital sensors; Efficient reconstruction; Infrared testing; Interesting information; IR glass; Larger fields; Recording distance; Spatial light modulators; Stringent requirement; Thermal camera; Visible range; Visible wavelengths, Computer generated holography; Frequency bands; Holograms; Imaging systems; Infrared devices; Infrared radiation; Light modulators; Liquid crystals; System stability, Holographic displaysDOI: 10.1007/3DRes.04(2010)06