Volume 63, Number 5, September 2003
|Page(s)||694 - 700|
|Section||Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics|
|Published online||01 November 2003|
Sub-milliradiant divergence soft-X-ray laser by active plasma waveguiding in -pinch capillary discharge
Dipartimento di Fisica, Università dell'Aquila, gc LNGS INFN, INFM 67010 Coppito (L' Aquila) Italy
2 ENEA Dipartimento Innovazione, Divisione Fisica Applicata, CRE Frascati C.P. 65, 00044, Italy
3 Department of Experimental Physics, University of Pecs Ifjusag u. 6, Pecs, 7624, Hungary
4 MISDC of VNIIFTRI - Mendeleevo, Moscow Region, 141570, Russia
5 Institute of Physical Engineering, University of Technology Brno Technicka 2, 616 69 Brno, Czech Republic
Accepted: 19 June 2003
We report the observation of the sub-milliradiant divergence operation of a capillary discharge soft-X-ray laser, that indicates that X-ray radiation has been amplified in a refraction-guiding plasma active medium. The lasing is produced on the 46.9 transition of the -like . The 0.7 divergence, axially peaked-profile beam is obtained in the single-pass amplification regime. The comparison of the recorded laser beam profiles with the results of our computer simulations shows that the capillary discharge z-pinch forms an active plasma wave guide, which has the electron density profile with depression on its axis. The waveguiding of X-ray radiation and its amplification is demonstrated over a 30 long plasma column, where the laser operates in a saturated regime with energy of .
PACS: 42.55.Vc – X- and gamma-ray lasers / 52.40.Fd – Plasma interactions with antennas; plasma-filled waveguides / 41.50.+h – X-ray beams and X-ray optics
© EDP Sciences, 2003
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