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Toward compact and ultra-intense laser-based soft x-ray lasers

Abstract : We report here recent work on an optical field ionized (OFI), high-order harmonic-seeded EUV laser. The amplifying medium is a plasma of nickel-like krypton obtained by OFI when focusing a 1 J, 30 fs, circularly-polarized, infrared pulse into a krypton-filled gas cell or krypton gas jet. The lasing transition is the 3d(9)4d (J = 0) -> 3d(9)4p (J = 1) transition of Ni-like krypton ions at 32.8 nm and is pumped by collisions with hot electrons. The gain dynamics was probed by seeding the amplifier with a high-order harmonic pulse at different delays. The gain duration monotonically decreased from 7 ps to an unprecedented shortness of 450 fs full width at half-maximum as the amplification peak rose from 150 to 1200 with an increase of the plasma density from 3 x 10(18) to 1.2 x 10(20) cm(-3). The integrated energy of the EUV laser pulse was also measured, and found to be around 2 mu J. It is to be noted that in the ASE mode, longer amplifiers were achieved (up to 2 cm), yielding EUV outputs up to 14 mu J.
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Submitted on : Monday, February 26, 2018 - 3:17:54 PM
Last modification on : Monday, December 14, 2020 - 3:40:50 PM



Stéphane Sebban, Adrien Depresseux, Eduardo Oliva, Julien Gautier, F. Tissandier, et al.. Toward compact and ultra-intense laser-based soft x-ray lasers. Plasma Physics and Controlled Fusion, IOP Publishing, 2018, 60 (1), pp.014030. ⟨10.1088/1361-6587/aa8aaf⟩. ⟨hal-01717597⟩



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