AVS 54th International Symposium
    Plasma Science and Technology Thursday Sessions
       Session PS-ThP

Paper PS-ThP18
Computational Investigation of Volume Discharge in a Nitrogen Laser

Thursday, October 18, 2007, 5:30 pm, Room 4C

Session: Plasma Science and Technology Poster Session
Presenter: D.V. Suvorov, Ryazan State Radio Engineering University, Russia
Authors: S.M. Karabanov, Ryazan State Radio Engineering University, Russia
V.A. Korotchenko, Ryazan State Radio Engineering University, Russia
D.V. Suvorov, Ryazan State Radio Engineering University, Russia
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The laser on the basis of the second positive nitrogen system is one of the most powerful sources of UV–radiation (wave-length – 337 nanometers). The central disadvantage of a nitrogen laser obstructing to average power increase, is its low (0.1-0.3 %) efficiency. Influence of rate of interelectrode voltage rise and value peak capacity on energy of pulse radiation and pumping efficiency is investigated in the present work by means of numerical simulation for the nitrogen laser with transversely pumped and the capacitive energy storage. It is shown, that the rate increase of interelectrode voltage rise augments radiation pulse energy. It is caused by increase of the attainable overvoltage degree and energy accumulated in capacity. Simultaneously time of discharge formation and duration of impulse pumping decrease that leads to increase of radiation pulse energy. Existence of the optimum rate of interelectrode voltage rise is determined at which peak pumping efficiency is reached. At large values of rise rate the pumping efficiency decrease is explained by increase of reduced electric field intensity and primary energy input displacement from processes of excitation to ionization. On the one hand peak capacity increase leads to raise of energy entered into discharge that leads to inversion increase, and on the other hand - impulse pumping duration increases, that reduces inversion. Results of calculation show, that to increase pumping efficiency of the laser it is advisable to reduce peak capacity value at simultaneous increase of its charge voltage in order to keep its accumulated energy. The obtained results indicate the possibility of considerable increase of the nitrogen laser efficiency by providing of optimized pumping conditions.