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Tailored material functionalization by shaped femtosecond laser pulses

: Kontermann, S.; Baumann, A.L.; Gimpel, T.; Gabler, A.; Schippers, W.; Saring, P.; Seibt, M.; Schade, W.

Gerhard, C. (Ed.):
Laser ablation. Fundamentals, methods and applications
New York: Nova Science Publishers, 2015
ISBN: 978-1-63482-589-4
ISBN: 1-63482-622-1
ISBN: 978-1-63482-622-8
ISBN: 1-63482-589-6
Book Article
Fraunhofer HHI ()

Tailoring materials by microstructuring, nanostructuring, coating or other techniques is one of the most used methods in modern materials science. The interaction of ultrashort laser pulses with materials offers a new way of material property tailoring, as the interaction time is so short that no heat transfer from photons to the material's crystal lattice is possible. These ultrafast lasers as attractive and reliable tools for material processing on the scale of optical wavelengths with the purpose of structuring, hyperdoping or other functionalization goals steadily move more into focus. However, often numerous laser processing parameters like the pulse energy or the number of pulses per spot have to be varied over a wide range until a satisfactory level of material perfomance is achieved in such material processing experiments. In this article, we report on an automated approach of finding optimized laser parameters based on adaptive laser pulse shaping, that is tran sferred to laser material processing. We focus on processing silicon and metals with femtosecond laser pulses and show how these materials can be tailored for application in photovoltaics, lighting and energy storage.