Berlin 2012 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 17: Poster Session

MM 17.74: Poster

Montag, 26. März 2012, 17:00–19:00, Poster B

Characterization Strategies for Material Processing with Structured fs-Laser Pulses — •Conrad Schuster, Anna Svanidze, Neeke Rothe, Steffen Fiedler, Robert Irsig, Anna Oniszczuk, Josef Tiggesbäumker, Karl-Heinz Meiwes-Broer, and Stefan Lochbrunner — Institute of Physics, University of Rostock, Germany

Material processing with ultrashort laser pulses attracts considerable attention since it allows for micro machining with highest precision. The characteristics of both laser pulse and processed material determine plasma formation and the appearance of the subsequent breakdown of the material. To optimize the machining process and to understand the laser material interaction, online characterization methods are highly desirable. For this purpose we have developed two setups, one is to observe the time dependent material response on the laser pulse impact and the other is to characterize the obtained structures at the location of processing. In the first setup the output of a Ti:Sa fs laser system is split into two beams. The first beam passes through a pulse shaper and provides structured NIR pulses for the machining process. The second one is frequency doubled and the resulting blue probe pulses are guided via a delay stage through the same focusing objective as the machining pulses. The transmitted blue light is recorded by a CCD camera to study the evolution of the plasma generated by the NIR pulses. In the second setup the objective for machining is simultaneously used as the front end of a confocal microscope. This enables an online characterization of the generated microscopic structures.