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XUV Focusing Optics

XUV Focusing Optics. Jörg Schwenke FRED Seminar 17.06.2008. Coherent imaging with high-order harmonics. Schwarzschild objective. Divergence of incoming beam: Θ = 0.04°. beam position, D. tilt angle, α. Tilt angle can be adjusted between 6.5° and 9°

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XUV Focusing Optics

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  1. XUV Focusing Optics Jörg Schwenke FRED Seminar 17.06.2008

  2. Coherent imaging with high-order harmonics

  3. Schwarzschild objective Divergence of incoming beam: Θ = 0.04° beam position, D tilt angle, α

  4. Tilt angle can be adjusted between 6.5° and 9° • Half angle of aperture is constant, φ = 1.1 ° • Spatial resolution limit R = λ / (2*sin(φ)) = 1 µm

  5. Now: Higher divergence of HHG beam Coating selects 38nm Θ = 0.08° D = 3.4 mm α = 7.3° φ ≈ 2 R ≈ 550 nm D α φ

  6. SW Spot diagrams Detector plane Focal point

  7. Focusing with two spherical mirrors r = 400 mm f = 200 mm Coating selects 32 nm 600 mm

  8. Focusing with two spherical mirrors r = 400 mm f = 200 mm Coating selects 32 nm Virtual focal point 350 mm

  9. Short mirror distance 100 mm ϕ ≈ 0.85 R = 1 µm

  10. SM Spot diamgrams Detector plane Focus point

  11. Diffraction: Zoneplates Coherent Field Synthesis...?

  12. Conclusions On FRED • Script system is difficult to get into • Some problems with GUI / Settings On XUV focusing • Further use of SW • Spherical mirrors with shorter focal length • Zoneplates

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