Line-Focus Generation for X-Ray Laser Pumping
Down-scaling of 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.
KeywordsDiffraction Limit Parabolic Mirror Spherical Mirror Line Focus Intermediate Focus
This work was supported by the Swiss National Science Foundation (SNSF). F. Staub was supported by the Swiss National Science Foundation under D. Bleiner’s Förderungsprofessur (grant PP00P2-133564/1).