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.
© 2011 Optical Society of America
Lasers and Laser Optics
Original Manuscript: June 17, 2011
Revised Manuscript: September 23, 2011
Manuscript Accepted: September 28, 2011
Published: December 20, 2011
Davide Bleiner, Jürg E. Balmer, and Felix Staub, "Line focusing for soft x-ray laser-plasma lasing," Appl. Opt. 50, 6689-6696 (2011)