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- W2020650487 abstract "In this paper we review the development of a soft-x-ray laser at 21.2 nm, recently carried out at the Laboratoire de Spectroscopie Atomique et Ionique. Amplification is generated by electron collisional pumping on a ${2mathrm{s}}^{2}$${2mathrm{p}}^{5}$3p-${2mathrm{s}}^{2}$${2mathrm{p}}^{5}$3s, J=0--1 transition in neonlike zinc (${mathrm{Zn}}^{20+}$). The lasing medium is a ensuremath{sim}150 ensuremath{mu}mifmmodetimeselsetexttimesfi{}2 cm line plasma produced by irradiating slab Zn targets at a net intensity of ensuremath{sim}1.4ifmmodetimeselsetexttimesfi{}${10}^{13}$ W ${mathrm{cm}}^{mathrm{ensuremath{-}}2}$, using a 1.06-ensuremath{mu}m, 600-ps-long pulsed laser delivering ensuremath{sim}350 J of net energy on the target. Accompanying the driving pulse by a 100-mJ-level prepulse train through deliberately imperfect isolation of the mode-locked laser oscillator, the J=0--1 gain coefficient ensuremath{sim}5 ${mathrm{cm}}^{mathrm{ensuremath{-}}1}$ is generated. The emission appears in an ensuremath{sim}100-ps burst and precedes the lasing on both the much weaker J=2--1 lines and the x-ray continuum peak. The J=0--1 output source region, the beam spatial profile, and its time history have been measured and their relevance to the kinetics of this lasing system is discussed. A half cavity was implemented and a strong double-pass amplification at 21.2 nm with a 2-cm-long plasma obtained. With the gain-length product achieving ensuremath{sim}17.3 according to the particular configuration, saturation was demonstrated, which is confirmed through a schematic model of the level kinetics. To our knowledge, it is the first neonlike soft-x-ray laser where saturation on the J=0--1 line was achieved by using a half-cavity arrangement. Absolute energy measurements indicate ensuremath{sim}400 ensuremath{mu}J in the half-cavity-generated beam and a peak output power of ensuremath{sim}5 MW, which makes this laser one of the most efficient soft-x-ray lasing systems demonstrated to date." @default.
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- W2020650487 date "1997-05-01" @default.
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- W2020650487 title "Efficient, high-brightness soft-x-ray laser at 21.2 nm" @default.
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- W2020650487 doi "https://doi.org/10.1103/physreva.55.3858" @default.
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