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An iterative approach for modeling the interaction of a partial coherent light distribution with an absorbing photosensitive polymer

Publication date 2012
B-Phot Authors Wendy Meulebroeck, Hugo Thienpont
DOI 10.1117/12.921828
Citation
S. Heyvaert, Y. Meuret, W. Meulebroeck, and H. Thienpont, “An iterative approach for modeling the interaction of a partial coherent light distribution with an absorbing photosensitive polymer,” presented at the Proc. SPIE, Photonics Europe 2012, 2012, vol. 8429, p. 84291J.
Abstract The propagation of coherent light through a heterogeneous medium is an often-encountered problem in optics. Analytical solutions, found by solving the appropriate differential equations, usually only exist for simplified and idealized situations limiting their accuracy and applicability. A widely used approach is the Beam Propagation Method in which the electric field is determined by solving the wave equation numerically, making the method time-consuming, a drawback exacerbated by the heterogeneity of the medium. In this work we propose an alternative approach which combines, in an iterative way, optical ray-tracing simulation in the software ASAP (TM) with numerical simulations in Matlab in order to model the change in light distribution in a medium with anisotropic absorption, exposed to partially coherent light with high irradiance. The medium under study is a photosensitive polymer in which photochemical reactions cause the local absorption to change as a function of the local light fluence. Under continuous illumination, this results in time-varying light distributions throughout the irradiance process. In our model the fluence-absorption interaction is modelled by splitting up each iteration step into two parts. In the first part the optical ray-tracing software determines the new light distribution in the medium using the absorption from the previous iteration step. In the second part, using the new light distribution, the new absorption coefficients are calculated and expressed as a set of polynomials. The evolution of the light distribution and absorption is presented and the change in total transmission is compared with experiments.
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