The influence of stimulated electromagnetic radiation in optical part of spectra (visible,
UV and IR) to materials is for almost half a century the issue of research including a lot of
unexplained processes and stances. From one point of view represents new form of source
and from the other the relation to spontaneous sources in the same spectral area as well as the
power. The issues could be divided into theoretical-experimental processes from
biomodulation to destruction and to the area where coherent radiation is used in diagnostic
methods for material study.
In this thesis the subject was approached from theoretical-experimental side. The
observation of materials was forwarded trough material response functions, meaning trough
their collective role expressed using optical characteristic materials. In experimental part of
the thesis a series of experiments was conducted, determining certain optical parameters for
chosen samples along with spectroscopic approach. That woul...d be the first approach for
following series of experiments in which plant samples namely seeds (wheat, corn, spinach,
basil, thyme) where axposed to various types of laser beams (He-Ne, Nd3+:YAG,
semiconductor) on basic transitions and according to laser possibilities at higher harmonics.
The results of sample irradiation with given parameters, were monitored until the end of
vegetation periods. The morphological characteristic of irradiated and nonirradiated samples
were monitored as well as quantitative indicators of induced modifications. In given area of
energy densities and exposition doses, almost all samples shown positive influence of
coherent radiation. For some of the samples a change in FT-IR spectra was observed.
For use of lasers in main processes, occurring in metrology where linear and nonlinear
characteristics of materials occurs, scattering, absorption and fluorescence of materials
including materials of the live world (tissue, cells and their parts). These processes are
observed and used for optical defining of objects, and from their values (characteristic) and
from wavelength of the used light depends which effect will overcame including resonance.
In the area of techniques based on static and dynamic scattering angular distributions play a
considerable role in determination of objects by size and shape. So in this thesis, using chosen
software, a number of angular distribution simulations was done for microorganisms, typical
particles and water. Given approach could using data bases or newly measured values,
without modifications, be used for other adequate samples, simplifying the experiments in
advance including characteristic maxima at certain angles for chosen samples.
Ecological side of laser application viewed through accidental (fire) processes contains
multitude of approaches from use of lidars to sensory role of much simpler systems. In this
thesis the approaches to monitoring of certain area (ground, earth, different covers, water
areas, atmosphere phenomena) are perceived trough analysis of possible remote devices lidar
based. It’s a principal including fire processes here analyzed, searching for possibilities of
software support, covering certain experimental settings. The nature of combustion products
could be also viewed by simulation of scattering processes (propane and acetylene sooth).
Faculty:
Универзитет у Крагујевцу, Факултет техничких наука, Чачак
