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Parametric studies of an electron-beam-pumped krypton-rich KrF laser

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Abstract

The electron-beam-pumped KrF laser offers the highest efficiency at short wavelength. Although the maximum intrinsic efficiency of around 10% is attainable at appropriate pumping conditions, further improvement is still an important issue for achieving an overall ICF driver efficiency in excess of 5 %. Recently oscillator performance has been investigated in Ar-free mixtures at pressures of around 1 atm.1,2 The results of theoretical kinetic simulations indicate that the Kr-rich mixture can achieve higher intrinsic efficiency due to increased KrF formation efficiency and higher extraction efficiency. To date, oscillator experiments have not been able to demonstrate the theoretically predicted improvement in intrinsic efficiency at high Kr concentration. However, slightly larger or comparable efficiency to that at high Ar concentration has been reported.3,4 We have analyzed the fundamental parameters to understand the KrF* formation and the energy extraction processes by combining experimental measurements with theoretical calculations as a function of Kr concentration.

© 1986 Optical Society of America

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