1,721,041 research outputs found
Studio : modellistica teorico-numerica di un laser a CO2 di altapotenza a fascio elettronico - RELAZIONE FINALE DI ATTIVITA' AL CENTRO RICERCHE FIAT DI ORBASSANO, TORINO.
No full textA symmetrization rule for collision energies in molecular vibrational transitions
No full textIn order to reduce the discrepancies between first-order transition probabilities relevant to inelastic molecular-collision problems as calculated using classical models and the quantum-mechanical results, we investigate the analytic forms available in the two theories for standard model examples and we find a substantial rule able to bring the classical expression to equality with the quantum one, in the WKB approximation
Calculations on small signal gain profiles in a c.w. high power electron beam initiated CO2 laser
No full textUsing kinetic and gas-dynamic equations we solve a numerical model giving main fluid-dynamic parameters and small signal gain profiles in the laser chamber of a high power electron-beam initiated CO2 laser for a couple of typical working mixtures
Il campo di induzione magnetica prodotto da una spira piana percorsa da corrente: un approccio geometrico
No full textStudio : aspetti elementari dei processi di trasferimento di energia vibrazionale in miscugli gassosi. Caso di una miscela laser a He:N2:CO2:CO - RELAZIONE AL CNR, PROGETTO FINALIZZATO LASER DI POTENZA.
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Diffraction Patterns of Self-Phase-Modulated Laser Beams.
No full textTransverse optical intensity redistribution phenomena like self-focusing, self-defocusing and ring generation happen when a Gaussian laser beam is focused onto a nonlinear medium. We introduce a method for the evaluation of the diffraction pattern that is very simple, quick and suitable for computer implementation
High-power electron beam preiozed CO2 cw laser modelling. III. Kinetic and fluid-dynamic model
No full textIn this paper, which is the third part of a work devoted to modelling high-power CO2 lasers, the kinetic and fluid- dynamic model of the investigated device is presented. The kinetic model takes into ac¬count intermode vibrational exchange and vibrational-energy transfer among different molecular species (C02, N2 and CO). The fluid-dynamic equations have been reduced to a single equation coupled to kinetic and discharge equations via gas flow velocity in the discharge chamber. Effects of temperature, density and velocity variations in the flowing mixture on laser small signal gain have been investigated by using a numerical code based on the above theoretical model. Profiles of sustainer current, small signal gain and fluid-dynamic parameters in the discharge chamber have been obtained. The output power has been calculated by using a simplified model for the optical cavity. Finally, numerical and experimental results are compared
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