Design of photosensitive systems for laser induced polymerization reactions
The photosensitive systems for UV curing and imaging applications (such as 3D stereolithography, photopolymers in laser-to-plate imaging systems, holographic recording films or holographic optical elements) are extensively investigated. One of the most difficult challenges encountered nowadays is to extend the spectral sensitivity of photoinitiating systems to the visible light region. The design of efficient photosensitizer/photoinitiator combinations depends on understanding of the system of reactions which occur upon irradiation. The time resolved laser absorption spectroscopy combined with steady experiments appears to be a very convenient tool allowing to improve the efficiency of photoinitiating systems. This paper presents analysis of the excited state processes (in solution or in bulk) in selected examples of the efficient photosensitive systems (for conventional light and laser induced polymerization reactions) which are of great practical use, e.g., in holographic recording or laser imaging.
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