XXVI ENFMC - Annals of Optics Volume5- 2003 Holographic Techniques to Study Reaction Kinetics in Photosensitive Materials

We use a phase-modulated two-wave mixing experiment with simultaneous measurement in both transmitted beams directions to study photoreaction kinetics in the positive photoresist AZ1518 (novolak-diazoquinone). From the processed two-wave mixing signals we obtained the real time evolution of the refractive index and absorption coefficient, which were compared with independent measurements. To obtain the kinetic constants from the temporal evolution of the optical constants, a model of two chain photosensitive reactions was developed