Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010spie.7739e.150b&link_type=abstract
Modern Technologies in Space- and Ground-based Telescopes and Instrumentation. Edited by Atad-Ettedgui, Eli; Lemke, Dietrich.
Astronomy and Astrophysics
Astronomy
Scientific paper
Volume Phase Holographic Gratings (VPHGs) are dispersing elements which are finding wide spread in modern optical instrumentations, also in the astronomical field. Since photochromic materials show a change in the refractive index (Δn) upon photoirradiation, in principle they can be conveniently applied to produce rewritable holographic devices for the near-IR region. Diarylethene-based photochromic films with Δn large enough to meet the basic requirements have been obtained. Photochromic VPHGs have been written by using a custom made holographic set-up, based on a Lloyd's mirror configuration. The efficiency of the photochromic gratings has been measured at different wavelength in the NIR region. A theoretical model to predict the refractive index profile as function of the substrate features has been developed. Finally, the efficiencies calculated by using the RCWA approach have been compared with the experimental values.
Bertarelli Chiara
Bianco Andrea
Pariani Giorgio
Zerbi Filippo Maria
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