Time-resolved measurement of the refractive index for photopolymerization processes

Dorkenoo, Kokou; van Wonderen, A. J.; Bulou, Hervé; Romeo, Michelangelo; Crégut, Olivier; Fort, Alain
September 2003
Applied Physics Letters;9/22/2003, Vol. 83 Issue 12, p2474
Academic Journal
A double-interferometer technique is employed to examine the dynamics of a photopolymerization process. The dye molecule is eosine Y. The refractive index and the thickness of the photopolymerizable film are measured as a function of time. During the photopolymerization process, the first quantity increases by 2%, while the second quantity decreases by more than 4%. Therefore, the refractive index cannot be measured by means of single-interferometer techniques. By fitting our experimental curves to a rate equation, the quantum yield and the absorption coefficient of the sample can be determined with good accuracy. © 2003 American Institute of Physics.


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