XeCl electro-discharge laser modeling is discussed. The pump parameters of a LC-contour excitation system are studied in XeCl laser using a Ne:Xe :HCl mixture. A computation model is developed for finding the parameters of laser. The dependence of generation energy from parameters of excitation system and mixture was determined.
The influence of gas mixing ratio on stability of quasi-steady mode of electro-discharge XeCl-lasers operation is discussed.
The simplified model for electric-discharge XeCl-laser is presented. Although there are many reports on the
models of XeCl-laser, for an analysis having clear physical sense it is useful to have a simplified kinetic model. The
model enables to calculate an electrons concentration, density of excimer XeCl* molecules and specific energy deposition
in active medium. The quasi-steady mode of discharge in XeCl-lasers is analyzed.
The not weakening interest to excilamps is bound to a possibility of reception of power impulses in the UV-field of a
spectrum with significant average power. These experimental compact models of excilamps are designed for different
applications in the field of medicine, biology, spectroscopy and so on. The lamps are executed on the basis of serial domestic
elements and blocks of own production. The lamps differ by compactness and simplicity of construction.
With the purpose of reception of energy of generation 0,2-1 J, two types of electrodischarge XeCl-laser excitation system
with was created.
The modeling procedure of XeCl-laser excitation systems is developed, allowing calculate the form of a voltage pulse on
laser electrodes and energy input in the active medium. The dependence of discharge gap resistance on time is usually
simulated by exponential empirical dependence. In this case the breakdown voltage of inter-electrode gap must be taken
from experimental data also. For each gas mixture, parameters of time dependence of discharge gap resistance and value
of inter-electrode breakdown voltage have different values. Consequently, the results, which are obtained in this manner,
have practical significance for definite gas ratio of mixture. We have developed the simple model, which takes into account
the dependence of discharge gap parameters from gas pressure and composition. The solution of Boltzmann equation
for electrons in electrical field (E/N) and calculation of kinetic processes may be carried out. In this case the effective
rate of electrons formation may be approximated as function of gas composition and (E/N). Results of one model are
compared to results of other model and experimental data.
The simplified model for electric-discharge XeCl-laser is presented. Although there are many reports on the models of XeCl-laser, for an analysis having clear physical sense it is useful to have a simplified kinetic model. The model enables to calculate an electrons concentration, density of excimer XeCl* molecules, specific energy deposition in active medium and generation energy. The quasi-steady mode of discharge in XeCl-lasers is analyzed. The influence of E/P on generation energy of quasi-steady mode of electro-discharge XeCl-lasers operation is discussed.
The original excitation system of electro-discharge laser is considered. The excitation system represents the LC-invertor on basis of artificial storage lines. Results of computer calculation of excitation system working characteristics are discussed. An advantage of this system is the possibility of time dependence control of energy input in discharge. These results are compared with experimental data.
The dependence of resistance of a discharge on time is discussed in this work. The linearized effective ionization coefficient near breakdown voltage is introduced. It is shown, that the time of a discharge formation depends only on the square under a curve of a dimensionless overvoltage on a discharge gap, instead of from its curve shape.
Svetlana Ostrovtsova, Alexander Volodenkov, Alexander Maskevich, Irina Artsukevich, Slavomir Anufrik, Alexander Makarchikov, Ivan Chernikevich, Vitali Stepuro
Three enzymes differing in their structural composition were irradiated by UV lasers to study the effect of temperature, protein concentration and addition of small molecules on their sensitivity to radiation exposure. The laser-induced effects were due to the structural complexity of the protein molecules and depended on the dose applied, the wavelength and the density of irradiation. The multi-enzyme 2- oxoglutarate dehydrogenase complex was subjected to pronounced irradiation-induced changes whereas the response of the two other enzymes was less significant. Reduction of the protein levels in irradiated samples was important under the XeCl laser coercion and the effects depended on the doses applied. The laser irradiation effects are suggested to be realized by means of conformational changes in the protein molecules and intermolecular association- dissociation processes.
The wide use at present of laser radiation of low intensity in the clinics for treatment of different diseases and for the stimulation of the vital activity of organism is linked to a certain extent with the presence of corresponding laser apparatus. The special role here is attributed to the lasers that are capable of generating ultra-violet radiation of high spectrum brightness and energy effectivity. The arm of this research was creation and testing on biological objects of compact, autonomous excimer XeCl- and KrF-laser. Considering the simplicity and reliability of the laser devise, automatically preionized discharge-pumped laser of the LC-generator type can be the most advantageous candidate for practical use, since UV spark preionization automatically precedes the main discharge with the time delay determined by the excitation circuit parameters and other equipment can be eliminated. Due to using the excitation circuit of the LC-generator type the primary high voltage source of comparatively small value may be used.
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