13 October 1994 Production of Fresnel lens in sol-gel-derived Ormocers by holography
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Micro Fresnel lenses were prepared from photosensitive organic-inorganic nanocomposites of the Ormocer-type by irradiation of films of 10 micrometers in thickness with an interference pattern of two laser beams, mixing a planar reference wavefront and a spherical object wavefront. To monitor the polymerization behavior of the organic groups during irradiation under real time conditions, a characterization method was developed to study changes in optical thickness nd by measuring changes of index of refraction and shrinkage during polymerization. Three-dimensional Fresnel structures were obtained by removing the unpolymerized areas by a solvent. Variation of index of refraction can also be obtained by diffusion of monomers in regions of higher light intensity. A model, similar to the Colburn- Haines model, is presented.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Peter William Oliveira, Peter William Oliveira, Herbert Krug, Herbert Krug, H. Kuenstle, H. Kuenstle, Helmut K. Schmidt, Helmut K. Schmidt, } "Production of Fresnel lens in sol-gel-derived Ormocers by holography", Proc. SPIE 2288, Sol-Gel Optics III, (13 October 1994); doi: 10.1117/12.188991; https://doi.org/10.1117/12.188991

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