The influence of tube-plate electrodes on the laser mode of a fast-transvere- flow C02 laser
The distribution of the electric field of a tube-plate transversal flow discharge C02 laser is numerically solved. It is helpful to understand the formation and improvement of the laser mode.
High-power multibeam CO2 laser for industrial applications
Abstract Multibeam CO2 lasers consist of a large number of closely packed parallel glass discharge tubes, all sharing a common plane parallel resonator. This paper describes construction and operation of a CW multibeam CO2 laser consisting 20 discharge tubes and cooled length of 1500 mm , delivering 1 kW power. A high-frequency pulser is used for producing preionization in all discharge sections for initiating the main DC discharge simultaneously in all discharge tubes. Plane parallel resonator consists of a plane ZnSe mirror of 90 mm diameter having 60% reflectivity and a gold-coated copper mirror of same diameter. This laser operates in waveguide regime and laser power is not critically sensitive to mirror misalignment.
A model of the excitation discharge of fast transversal flow lasers
A model of fast transversal flow CO/sub 2/ laser discharges is presented. Electron density and vibrational kinetics equations are solved simultaneously with one-dimensional inviscid flow equations, in order to study the effects of the evolution of hydrodynamic variables on discharge stability. The current-voltage characteristic is calculated, including the influence of laser radiation (optogalvanic effect). A relationship is given between fluid residence time and maximum input power density in the active medium, taking the maximum allowable electron density as a parameter. The results are in satisfactory agreement with the experiments of W.J. Wiegand et al. (1975). Expressions for the optimum length of the discharge zone and maximum power input to the active medium are derived. >