Calculated and experimental determination of a laser spark length in the gas-jet targets
A. N. Nechay1, V. E. Guseva1, A. A. Perekalov1, N. I. Chkhalo1
1Institute for Physics of Microstructures, Russian Academy of Sciences, Nizhny Novgorod, Russia
Email: valeriegus@ipmras.ru
The paper presents results of investigation of sizes of the laser sparks that are generated when exciting the gas-jet targets based on argon, krypton and xenon by impulse radiation of the Nd : YAG-laser with the impulse duration of 4 ns and the impulse energy of 0.8 J. The images of the laser plasma were obtained by means of an X-ray double-mirror microscope with five times magnification, that is based on the Schwarzschild lens, which operates at the wavelength of 11.25 nm. The gas-jet targets were investigated at the nozzle inlet gas pressure of 2-10 bar. The spark length values obtained from the experiment were compared with the theoretically calculated values. Keywords: laser spark, extreme ultraviolet radiation, gas-jet targets.
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