Abstract
In this paper, we describe the Z-scan measurements of the two-photon absorption (TPA) cross section of various two-photon initiators that are suitable for real three-dimensional structuring of photo-polymerizable formulation. The value of the TPA cross section for the initiator P3K was measured to be 256 GM as the maximum value among the synthesized initiators. Procedures for a precise Z-scan measurement including the measurement of Rayleigh length and beam waist radius are presented. The effect of the pulse width on the Z-scan signal is demonstrated. We also used a flow-cell geometry instead of a static cell in order to refresh the materials to avoid the decomposition of the molecules. This resulted in a more realistic TPA cross section which has been proven by suitable reference compounds.
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