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Absorption of laser radiation energy in the laser-plasma radiation source with gas-jet targets
Russian version
V. E. Guseva1, I. G. Zabrodin1, A. N. Nechay1, A. A. Perekalov1, N. I. Chkhalo1
1Institute for Physics of Microstructures, Russian Academy of Sciences, Nizhny Novgorod, Russia
Email: valeriegus@ipmras.ru
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The present study is taken to measure absorption of radiation of Nd:YAG-lasers with impulse duration 3.8-12.5 ns, the impulse energy 0.2-0.8 J in laser-induced breakdown of gas jets which are formed when the gas outflows through a supersonic conical nozzle with the critical section of 500 μm, the length of 5 mm and the flare angle of 9o. It also investigates integral and time dependences of absorption of laser radiation by plasma formed on the targets of molecular (CO2, CHF3, CF4, N2) and inert (Ar, Kr, Xe) gases on their pressure at the nozzle inlet and the laser impulse energy. For the various gas targets a portion of absorbed laser energy was from 25 % to 85 %. Keywords: gas-jet target, laser impulse, nozzle, gas outflow, absorption of radiation.
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