Line focusing for soft x-ray laser-plasma lasing

Bleiner, Davide; Balmer, Jürg; Staub, Felix (2011). Line focusing for soft x-ray laser-plasma lasing. Applied optics, 50(36), pp. 6689-6696. Washington, D.C.: Optical Society of America 10.1364/AO.50.006689

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Text ao-50-36-6689.pdf - Published Version Available under License Publisher holds Copyright. This paper was published in Applied Optics and is made available as an electronic reprint with the permission of OSA. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law. Download (1MB) | Preview

A computational study of line-focus generation was done using a self-written ray-tracing code and compared to experimental data. Two line-focusing geometries were compared, i.e., either exploiting the sagittal astigmatism of a tilted spherical mirror or using the spherical aberration of an off-axis- illuminated spherical mirror. Line focusing by means of astigmatism or spherical aberration showed identical results as expected for the equivalence of the two frames of reference. The variation of the incidence angle on the target affects the line-focus length, which affects the amplification length such that as long as the irradiance is above the amplification threshold, it is advantageous to have a longer line focus. The amplification threshold is physically dependent on operating parameters and plasma-column conditions and in the present study addresses four possible cases.

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