21.06.2012. :: Seminar - Janez Mozina
LABORATORIJA ZA FIZIKU ATOMSKIH SUDARNIH PROCESA
PULSED LASER INDUCED MATERIAL MOTION AND FLUORESCENCE
PROF. DR JANEZ MOŽINA
FACULTY OF MECHANICAL ENGINEERING, UNIVERSITY OF LJUBLJANA, SLOVENIA
Cetvrtak, 21.06.2012. U 13 h u biblioteci Instituta za fiziku, Pregrevica 118 Zemun
Good understanding of light-matter interaction is important in view of basic science and for a number of laser applications in industry and medicine. In this lecture emphasis will be given to dynamic aspects of laser-beam surface interaction in which the absorption of laser pulses results in different kinds of macroscopic material motion. These phenomena have been widely studied in order to understand the interaction processes and to develop novel applications in several disciplines, such as non-destructive testing, spectroscopy, monitoring deexcitation processes and probing physical properties of materials. Within the various detection techniques we shall also describe a new and innovative method for high-speed two-frame shadowgraphy, which enables one to capture two temporally and spatially resolved images of laser induced plasma. It is used to measure the velocity of the ignition of the laser-induced plasma and the development of the shock wave within the nanosecond excitation-pulse as well as the velocities of the shock wave propagation and its decay into an acoustic wave motion. In addition we shall also describe some recent results of laser induced fluorescence on variety of nanocrystals produced by flame spray pyrolysis and combustion related to the development of noncontact temperature measurements.