[institut] Najava seminara

[Bratislav Marinkovic]

LABORATORIJA ZA FIZIKU ATOMSKIH SUDARNIH PROCESA

 najavljuje
seminar 

 PROF. DR JANEZ MOŽINA
_ FACULTY OF MECHANICAL ENGINEERING,
UNIVERSITY OF LJUBLJANA, SLOVENIA _

 "PULSED LASER INDUCED MATERIAL
MOTION AND FLUORESCENCE" 

četvrtak, 21.06.2012. U 13 h u biblioteci
Instituta za fiziku, Pregrevica 118 Zemun 

Abstrakt: 

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. 

Prof. dr Janez
Možina će održati seminar i na PMF Univ. u Novom Sadu, 22.06.2012.
godine.

"OPTODYNAMICS - A NEW INTERDISCIPLINARY RESEARCH FIELD" 


Abstract 

The lecture will be devoted to the description of
optodynamics as a new interdisciplinary research area dealing with
mechanical aspects of the interaction between light and matter. In
accordance with this definition a wide spectrum of phenomena can be
treated associated with optodynamics: 

 	* high intensity
optoacoustics
 	* laser-induced shock waves
 	* laser ultrasonics
 	*
pulsed laser materials processing
 	* pulsed laser medicine
 	* laser
propulsion
 	* etc…

In view of optodynamics a laser beam is not only
considered as a tool but also as a generator of information about the
material processes. The information is retained and conveyed by
different kinds of optically induced mechanical waves and in some cases
also by macroscopic motion of the illuminated object. Several
generation/detection schemes will be described how to extract this
information to monitor some pulsed laser manufacturing processes.
Attention will be also be given to one dimensional model,
optical-to-mechanical energy conversion efficiency, linear momentum flow
associated with laser ablation and to on-line observation of the
workpiece deformation during laser processing using rapid 3D laser
profilometry. 

 
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