Microdroplet evolution induced by a laser pulse |
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| Authors: | M B Smirnov I Yu Skobelev A I Magunov A Ya Faenov T A Pikuz Y Fukuda K Yamakawa Y Akahane M Aoyama N Inoue H Ueda |
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| Institution: | (1) Russian Research Centre Kurchatov Institute, Moscow, 123182, Russia;(2) Moscow Institute of Physics and Technology, Dolgoprudnyi, Moscow oblast, 141700, Russia;(3) All-Russia Research Institute of Physicotechnical and Radio Engineering Measurements, Mendeleevo, Moscow oblast, 141570, Russia;(4) Japan Atomic Energy Research Institute, Kyoto 619-0215, Japan |
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| Abstract: | Interaction between high-power ultrashort laser pulse and giant clusters (microdroplets) consisting of 109 to 1010 atoms is considered. The microdroplet size is comparable to the laser wavelength. A model of the evolution of a microdroplet plasma induced by a high-power laser pulse is developed, and the processes taking place after interaction with the pulse are analyzed. It is shown theoretically that the plasma is superheated: its temperature is approximately equal to the ionization potential of an ion having a typical charge. The microdroplet plasma parameters are independent of the pulse shape and duration. The theoretical conclusions are supported by experimental studies of x-ray spectra conducted at JAERI, where a 100-terawatt Ti-sapphire laser system was used to irradiate krypton and xenon microdroplets by laser pulses with pulse widths of 30 to 500 fs and intensities of 6×1016 to 2×1019W/cm2. |
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