Observatorio de I+D+i UPM

Descripción
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 3d94d (J?=?0)?3d94p (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 halfmaximum as the amplification peak rose from 150 to 1200 with an increase of the plasma density from 3?×?1018 to 1.2?×?1020 cm?3. The integrated energy of the EUV laser pulse was also measured, and found to be around 2 ?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 ?J.
Internacional	Si
JCR del ISI	Si
Título de la revista	Plasma Physics And Controlled Fusion
ISSN	0741-3335
Factor de impacto JCR	2,392
Información de impacto
Volumen	60
DOI
Número de revista
Desde la página	014030
Hasta la página	014030
Mes	SIN MES
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• Creador: Centro o Instituto I+D+i: Instituto de Fusión Nuclear