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Optimization of the wave front of high order harmonics |
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| Authors: | J Gautier P Zeitoun C Hauri A-S Morlens G Rey C Valentin E Papalarazou J-P Goddet S Sebban F Burgy P Mercère M Idir G Dovillaire X Levecq S Bucourt M Fajardo H Merdji J-P Caumes |
| Institution: | 1. Laboratoire d'Optique Appliquée, école Nationale Supérieure de Technique Avancées, école Polytechnique, CNRS UMR7639, Chemin de la Hunière, 91761, Palaiseau Cedex, France 2. Synchrotron SOLEIL, 91192, Gif-sur-Yvette Cedex, France 3. Imagine Optic, 18 rue Charles de Gaulle, 91400, Orsay, France 4. Instituto de Plasmas e Fus?o Nuclear, Instituto Superior Técnico, Av. Rovisco Pais, 1049-001, Lisboa, Portugal 5. Commissariat à l'énergie Atomique, Service des Photons, Atomes et Molécules, Batiment 522, Centre d'étude de Saclay, 91191, Gif-sur-Yvette, France |
| Abstract: | We present a full optimization of the high harmonics wave front owing to the use of a soft X-ray Hartmann sensor. The sensor was calibrated using a high harmonic source with an accuracy of λ/50 root-mean-square (rms) with λ around 30 nm. We observed a high harmonic wave front of λ/7 rms, which is two times the diffraction-limit, astigmatism being the dominant aberration for every condition of generation. By clipping slightly the unfocused high harmonic beam, it is possible to produce a diffraction-limited beam containing approximately 90% of the incident energy. |
| Keywords: | PACS" target="_blank">PACS 42 15 Dp Wave fronts and ray tracing 07 85 Fv X- and gamma-ray sources mirrors gratings and detectors |
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