Dependence of the cutoff in lithium plasma harmonics on the delay between the prepulse and the main pulse

作者：Suzuki M^*; Baba M; Ganeev R A; Bom L B Elouga; Kuroda H; Ozaki T

来源：Journal of Physics B: Atomic, Molecular and Optical Physics , 2012, 45(6): 065601.

DOI：10.1088/0953-4075/45/6/065601

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.

• 出版日期2012-3-28