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Line-Focus Generation for X-ray Laser Pumping

Type of publication Peer-reviewed
Publikationsform Proceedings (peer-reviewed)
Author Staub Felix, Bleiner Davide, Jia Fei, Balmer Jürg,
Project "ELAN" - EUV Laser for Actinic Nano-imaging.
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Proceedings (peer-reviewed)

Title of proceedings Conference on X-ray Lasers
Place Paris


Down-scaling X-ray lasers towards shorter wavelengths imposes the need for higher irradiance of the pump laser systems. Typically, for a factor of 2 reduction in wavelength, a factor of ~10 increase in irradiance was so far required. This discourages the use of refractive optics after the compressor stage of the high-power CPA laser systems commonly used for pumping X-ray lasers due to increasing nonlinear phase distortion (B-Integral). We present ray-tracing calculations of alternative focusing schemes applying reflective optics for grazing-incidence line- focus generation. The proposed mirrors deliver a narrow and shortened line focus from a high-aperture input beam, yielding an increase of irradiance on target.