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Demonstration of a Circularly Polarized Plasma-Based Soft-X-Ray Laser
Depresseux, A.,Oliva, E.,Gautier, J.,Tissandier, F.,Lambert, G.,Vodungbo, B.,Goddet, J-P.,Tafzi, A.,Nejdl, J.,Kozlova, M.,Maynard, G.,Kim, H. T.,Phuoc, K. Ta,Rousse, A.,Zeitoun, P.,Sebban, S. American Physical Society 2015 Physical review letters Vol.115 No.8
Toward compact and ultra-intense laser-based soft x-ray lasers
Sebban, S,Depresseux, A,Oliva, E,Gautier, J,Tissandier, F,Nejdl, J,Kozlova, M,Maynard, G,Goddet, J P,Tafzi, A,Lifschitz, A,Kim, H T,Jacquemot, S,Rousseau, P,Zeitoun, P,Rousse, A IOP 2018 Plasma physics and controlled fusion Vol.60 No.1
<P>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<SUP>9</SUP>4d (<I>J</I>?=?0)?→?3d<SUP>9</SUP>4p (<I>J</I>?=?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?×?10<SUP>18</SUP> to 1.2?×?10<SUP>20</SUP> cm<SUP>−3</SUP>. The integrated energy of the EUV laser pulse was also measured, and found to be around 2 <I>μ</I>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 <I>μ</I>J.</P>