Europhys. Lett., 63 (5) , pp. 694-700 (2003)
Sub-milliradiant divergence soft-X-ray laser by active plasma waveguiding in z-pinch capillary dischargeA. Ritucci1, G. Tomassetti1, A. Reale1, L. Palladino1, L. Reale1, F. Flora2, L. Mezi2, S. V. Kukhlevsky3, A. Faenov4, T. Pikuz4, J. Kaiser5 and O. Consorte1
1 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
(Received 17 April 2003; accepted in final form 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 .
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