Abstract
A technique is suggested to measure the threshold of two-photon initiated photopolymerization involving a Z-scan of a thin film of sensitive material along the focusing axis of the laser beam. A condition of reaching the threshold when scanning the sample along Z-direction is identified via interferometric effect. The technique is demonstrated for measurements employing Nd:YAG laser in nanosecond regime with fundamental frequency 1064 nm and its harmonic of 532 nm. Threshold data are presented for particular systems, indicating a threshold of 5 GW/cm2 for a system based on Rose Bengal exposed by a 1064 nm nanosecond-pulsed radiation and 0.05 GW/cm2 for Darocur initiators exposed to 532 nm.
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