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Optica Publishing Group
  • Conference on Lasers and Electro-Optics
  • OSA Technical Digest (Optica Publishing Group, 1991),
  • paper CThE6

Nature of high-current volumetric discharge stability in XeCl excimer laser

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Abstract

It is well known that the steady-state solution of the system of equations describing a high-current discharge in XeCl laser gas mixture He(Ne)-Xe-HCl is unstable. The instability increment depends on the specific excitation power and achieves 107 ÷ 108 s−1. At the same time, the uniform discharge duration may exceed 1 μs1, while the value of the instability increment g ≃ 2 × 107 s−1 for such experimental conditions. Naturally, the wave impedance of the external circuit stabilizes a discharge with respect to uniform volumetric fluctuations of the electron density.1 But in the usual case of spatially non-uniform fluctuations with transverse dimension of several millimeters, such a stabilization would seem impossible (or it would require too large an external inductance, which restricts effective pumping), because the current filament wouldn't cause essential shunting of the discharge gap in the initial reversible stage of the breakdown development. The nature and conditions of discharge stability are of special interest for long-pulse operated excimer lasers and for excimer lamps.

© 1991 Optical Society of America

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