Berlin 2014 – scientific programme

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K: Fachverband Kurzzeitphysik

K 1: Optische Methoden und Verfahren

K 1.2: Talk

Monday, March 17, 2014, 14:30–14:45, SPA SR203

Analysis of Laser-Induced Plasma by Time-Resolved In-Line Holography — •Neeke Rothe, Christoph Merschjann, Conrad Schuster, Thomas Fennel, and Stefan Lochbrunner — Institut für Physik, Universität Rostock, D-18051 Rostock, Germany

Dense laser-induced plasmas attract strong scientific interest. They are crucial in understanding the interaction between condensed matter and intense laser radiation as well as for the processes relevant to laser machining. Furthermore they provide an elegant and powerful approach to study warm dense matter.
Here we describe a technique to investigate the evolution of a laser plasma with spatial and high temporal resolution. To this end the pump-probe technique utilizing ultrashort pulses is combined with the evaluation of diffraction patterns. A dense laser plasma is generated by exciting a 30 nm thick gold foil with tightly focused femtosecond pulses at 800 nm. The plasma evolution is probed by delayed 400 nm pulses in transmission and the resulting diffraction pattern of the probe is recorded by a CCD-camera. The optical properties of the plasma can be deduced from the diffraction pattern by an iterative algorithm which is based on the angular spectrum method and the concept of in-line holography. First numerical results with computer-generated test objects are shown and discussed with respect to the experimental data.