Modeling of XeCl-laser excitation systems on storage capacitors
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 to 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
Dependence of plasma resistance on time in electro-discharge excimer lasers
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.
Theoretical analysis of a self-sustained discharge pumped XeCl laser
Theoretical analysis of the discharge characteristics and the output performance of a self‐sustained discharge XeCl laser is described. Validity of the theoretical laser model including the excitation circuitry is confirmed by comparing the results with the measured discharge and output performance under lasing conditions. The dischare parameters such as E/P (E is the electrical field strength and P is the operating pressure) and discharge resistivity are theoretically studied for both Ne‐ and He‐based gas mixtures. Our model shows that the electron energy distribution functions of these two mixtures become quite equal at each quasi‐steady‐state E/P, and that the improved laser output performance with Ne‐based gas mixtures is not due to the difference of the electron energy distribution function but due to the good optical extraction caused by the faster ion‐ion recombination excimer formation channel. Moreover, the model also predicts that the depletion of HCl molecules is one of the most serious problem...