Dependence of the cutoff in lithium plasma harmonics on the delay between the prepulse and the main pulse
Masatoshi SuzukiOphthalmology and Advanced Laser Medical Center, Faculty of Medicine, Saitama Medical University, Morohongon 38, Moroyama-machi Iruma, Saitama 350-0495, JapanM. BabaOphthalmology and Advanced Laser Medical Center, Faculty of Medicine, Saitama Medical University, Morohongon 38, Moroyama-machi Iruma, Saitama 350-0495, JapanR. A. GaneevScientific Association Akadempribor, Academy of Sciences of Uzbekistan, Akademgorodok, Tashkent 700125, UzbekistanL. B. Elouga BomInstitut National de la Recherche Scientifique, 1650 boul. Lionel-Boulet, Varennes, Quebec J3X 1S2, CanadaHiroto KurodaOphthalmology and Advanced Laser Medical Center, Faculty of Medicine, Saitama Medical University, Morohongon 38, Moroyama-machi Iruma, Saitama 350-0495, JapanT. OzakiInstitut National de la Recherche Scientifique, 1650 boul. Lionel-Boulet, Varennes, Quebec J3X 1S2, Canada
ABI
Abstract
We demonstrated the generation of the 43rd harmonic at the wavelength of 18.49 nm (67 eV photon energy) by using laser-ablation lithium plasma irradiated by a Ti:sapphire laser pulse. We found that for low-Z material, such as lithium, the cutoff energy depends strongly on the delay time between the prepulse and the main pulse, due to rapid recombination. As a result, the maximum cutoff energy was obtained at a relatively short delay of 24 ns. From the theoretical cutoff rule and hydrodynamic simulations, we show that these harmonics were generated from singly charged lithium ions.
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