Zero-dimensional hybrid model for analysis of discharge excited XeCl lasers

Abstract

A powerful zero-dimensional hybrid model to study the positive column of a glow discharge used as an excitation medium for XeCl lasers is presented. This model was employed using a numerical code including three strongly coupled parts: electric circuit equations (electric model), electron Boltzmann equation (particle model), and kinetics equations (chemical kinetics model). From this hybrid model, kinetics and electrical parameters of Ne–Xe–HCl laser discharge mixtures have been discussed and analyzed. Calculated discharge current and voltage are also compared with available theoretical and experimental results. The good qualitative agreement observed shows the validity of the present model which can used as an efficient tool for the investigation of the homogeneous excimer laser discharge.

Simple model of halogen depletion in XeCl discharge pumped lasers

“…In the transverse mono-dimensional model developed, the plasma is represented by a whole of resistances in parallel, whose conductivity is obtained, for each one, in the same way as that for the zero-dimensional model [7,[23][24][25][26]. The problem is reduced to a whole of kinetic and electric equations described by a system of ordinary equations.…”

“…To describe the electric behaviour of the discharge in the plasma, and according to other previous works [17][18][19][20][21][22][23][24][25][26], we have established a full set of processes regrouped in 31 reactions involving 15 atomic, molecular, and photonic species, i.e., Ne, Xe, Xe à , NeXe þ , HCl (v ¼ 0, 1, 2, 3), Cl, Cl À , XeCl à , Xe 2 * , Xe 2 þ , e, hn (laser). The set of reactions and their rate coefficients used in the present calculations of the characteristics of Ne-Xe-HCl mixture of laser discharges are reported in Table I.…”

“…The electron density in each element of the plasma is obtained, as in the zero-dimensional model [23][24][25] by solving the electron Boltzmann equation (EBE) coupled with the kinetic equations of heavy species and electric circuit equations.…”

Effects of neutral particle dynamics in the active medium of discharge pumped XeCl lasers

“…However, the development of a dishomogeneity in the active medium of discharge lasers seems to play a key role in the deterioration process [7]. Theoretical models are now available to study the role of chemistry [8][9][10][11][12][13][14] and the effects of the non-uniform energy deposition and flowfield in discharge pumped XeCl excimer laser [15]. Unfortunately, their developments do not take into account the role of gas dynamics following the power deposition in the medium, which could be one of the causes that leads the discharge instability process.…”

Electrical and chemical properties of the XeCl phototriggered laser

“…A represents the electrode area and d the distance between the electrodes. In order to describe the electric behavior of the discharge, and according to other previous works [9][10][11][12][13][14], we have established a full set of processes regrouped in 31 reactions involving 15 atomic, molecular, and photonic species, i.e., Ne, Xe, Xe * , NeXe + , HCl (v = 0, 1, 2, 3), Cl, Cl − , XeCl * , Xe * 2 , Xe + 2 , e, hν (laser). The set of reactions and their rate coefficients used in the present work are reported in table I.…”