Berlin 2014 – scientific programme
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K: Fachverband Kurzzeitphysik
K 1: Optische Methoden und Verfahren
K 1.5: Talk
Monday, March 17, 2014, 15:15–15:30, SPA SR203
Gas puff characterization by high harmonics of an intense laser-pulse — •Bastian Hagmeister, Dirk Hemmers, and Georg Pretzler — Institut für Laser- und Plasmaphysik, Heinrich-Heine-Universität Düsseldorf
A method is presented for determining the temporal and spatial evolution of the gas density outside a pulsed nozzle. A set of High Harmonics of a short laser pulse is sent through the gas cloud, spectrally decomposed, and mapped using a CCD-camera. The partial absorption in the gas can be quantified and leads to the radial gas density distribution via Abel inversion. As an example, experiments with an Argon gas jet were carried out with densities in the range of 1017 cm−3 to 1019 cm−3.