Linear ablation features produced at identical peak powers and pulse numbers show improved machining resolution as dopant concentration increases. This increase in resolution is more prolific for R2 than R1 despite their similar TPA cross sections. We believe that this is due to the relative bandgaps of the materials causing three photon absorption for R2 whereas multiphoton absorption is limited to the second order process for R1. This means by doping appropriate materials with these molecules it is possible to improve resolution whilst maintaining most properties of the main material.
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Thomas Ward, Rakesh Arul, Reece N. Oosterbeek, Robert D. Breukers, M. Cather Simpson, "Enhancement of laser machining resolution using the two photon absorption effect," Proc. SPIE 10094, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XVII, 100941U (17 February 2017);