Author Affiliations
Abstract
Department of Physics/Applied Physics, University of Duisburg-Essen, Lotharstr. 1, 47057 Duisburg, Germany2Département de chimie, Université de Sherbrooke, Sherbrooke, Québec, Canada J1K 2R13COPL, Département de physique, génie physique et optique, Université Laval, Québec, Canada G1K7P4
Photo-induced processes in organic materials mostly occur on molecular levels. Excited molecules may split to form radicals, starting a polymerization process with diffusing monomers. The azo-dyes perform an optically induced cis-trans isomerization. During pattern formation like a holographic grating, the local temperature increase, especially in thin films, is up to date a subject of estimation from absorption and dissipation data. However, the exact knowledge of the surface temperature would help a lot in understanding the resulting refractive index and thickness patterns during holographic exposure. In this paper, in-situ pyrometer measurements are presented. As examples, different photosensitive materials, varying from a photopolymer to polycrystalline azo dyes, are used in order to outline the magnitude of this effect and demonstrate the feasibility of this technique.
高温计 黑体辐射 衍射效率 氮基染料 光敏聚合物 050.1940 Diffraction 090.2900 Optical storage materials 160.2900 Optical storage materials 350.5340 Photothermal effects Chinese Optics Letters
2008, 6(1): 0125