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Proceedings Paper

New method for recording large-size holograms of the reflective type with adjustable spectral characteristics in DCG
Author(s): Ernst Ulrich Wagemann; Philipp Froening; Christo G. Stojanoff
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Paper Abstract

Large scale holograms of the reflective type are applied on concentrating devices for photovoltaics and solar chemistry as well as in building applications. Especially in window applications holograms with best homogeneity in large scale are demanded by the house owners and architects. To meet this demand, we have used a scanning laser beam and internal total reflections in a moving prism for recording. This technique is usually applied to record holograms for the near infrared (NIR), but due to controlled mixture of gelatine and water-soluble polymer in addition with a matched thermo-chemical treatment the central wavelength can be adjusted in a wide range to special requirements. For application in solar chemistry we manufactured parabolic concentrators with holographic foils of size 50 cm by 10 cm in dichromated gelatine (DCG). The central wavelengths can be chosen between 400 nm and 600 nm with bandwidths of 50 nm as well as up to 200 nm. The comparison of the transmitted and reflected spectrum shows good agreement and consequently minimal scattering losses of the layer. A photovoltaic concentrator concept uses a silicon solar cell and a spectrally matched broad band spectral characteristic is required. A bandwidth of 600 nm can be achieved with a stack of two foil or even a single foil. Large scale e investigations (up to 100 cm by 10 cm)2 show best results of diffraction efficiency and large scale homogeneity.

Paper Details

Date Published: 20 December 1996
PDF: 11 pages
Proc. SPIE 2951, Holographic and Diffractive Techniques, (20 December 1996); doi: 10.1117/12.262411
Show Author Affiliations
Ernst Ulrich Wagemann, Technical Univ. of Aachen (Germany)
Philipp Froening, Technical Univ. of Aachen (Germany)
Christo G. Stojanoff, Technical Univ. of Aachen (Germany)


Published in SPIE Proceedings Vol. 2951:
Holographic and Diffractive Techniques
Guenther J. Dausmann, Editor(s)

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