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30 September 2005 Brilliant highly directive higher harmonics and soft x-ray lasers from solid target plasma pumped by tabletop Ti:S laser
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Abstract
We demonstrate the generation of high harmonics (up to the 65th order, λ=12.24 nm) of a Ti:sapphire laser radiation after the propagation of femtosecond laser pulses through the low-excited boron plasma produced by a prepulse radiation on the surface of different targets. High-order harmonics generated from the surface plasma of most targets showed a plateau pattern. The harmonic generation in these conditions assumed to occur due to the interaction of femtosecond pulses with ions. The conversion efficiencies in the plateau region were varied between 10-7 to 8×10-5 depending on the target. The main contribution to the limitation of harmonic generation efficiency and cutoff energy was attributed to the free-electrons-induced self-defocusing of main pulse.
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Hiroto Kuroda, Rashid Ganeev, Masayuki Suzuki, Motoyoshi Baba, Jun Zhang, and Tsuneyuki Ozaki "Brilliant highly directive higher harmonics and soft x-ray lasers from solid target plasma pumped by tabletop Ti:S laser", Proc. SPIE 5971, Photonic Applications in Nonlinear Optics, Nanophotonics, and Microwave Photonics, 597105 (30 September 2005); https://doi.org/10.1117/12.628534
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