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Title:	Time-resolved imaging of the laser forward transfer of liquids
Author:	Duocastella, M.; Fernández Pradas, Juan Marcos; Morenza Gil, José Luis; Serra Coromina, Pere
Other authors:	Universitat de Barcelona
Abstract:	Time-resolved imaging is carried out to study the dynamics of the laser-induced forward transfer of an aqueous solution at different laser fluences. The transfer mechanisms are elucidated, and directly correlated with the material deposited at the analyzed irradiation conditions. It is found that there exists a fluence range in which regular and well-defined droplets are deposited. In this case, laser pulse energy absorption results in the formation of a plasma, which expansion originates a cavitation bubble in the liquid. After the further expansion and collapse of the bubble, a long and uniform jet is developed, which advances at a constant velocity until it reaches the receptor substrate. On the other hand, for lower fluences no material is deposited. In this case, although a jet can be also generated, it recoils before reaching the substrate. For higher fluences, splashing is observed on the receptor substrate due to the bursting of the cavitation bubble. Finally, a discussion of the possible mechanisms which lead to such singular dynamics is also provided.
Subject(s):	-Òptica -Làsers -Mecànica de fluids -Materials biomèdics -Optics -Lasers -Fluid mechanics -Biomedical materials
Rights:	(c) American Institute of Physics, 2009
Document type:	Article Article - Published version
Published by:	American Institute of Physics
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