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1 October 2007High order harmonics wavefront measurement and optimization
J. Gautier,1 A. S. Morlens,1 P. Zeitoun,1 E. Papalarazou,1 G. Rey,1 C. Valentin,1 J. P. Goddet,1 S. Sebban,1 Guillaume Dovillaire,2 Xavier Levecq,2 Samuel Bucourt2
We present a full optimization of the high harmonics wave-front thanks to the use of a soft x-ray Hartmann sensor. The
sensor was calibrated using high harmonics source with a λ/50 accuracy. We observed relatively good high harmonics
wave-front, two times the diffraction-limit, with astigmatism as the dominant aberration for any interaction parameters.
By slightly clipping the unfocused beam, it is possible to produce a diffraction-limited beam containing about 90% of the
incident energy. The influence of high harmonic generation parameters was also studied in particularly the influence of
the infra-red wave-front. In particular we studied the correlation between the infrared wave-front use to create high
harmonics and the high harmonic wave-front. We also report wave-front measurements of a high order harmonic beam
into an x-ray laser plasma amplifier at 32.8 nm.
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J. Gautier, A. S. Morlens, P. Zeitoun, E. Papalarazou, G. Rey, C. Valentin, J. P. Goddet, S. Sebban, Guillaume Dovillaire, Xavier Levecq, Samuel Bucourt, "High order harmonics wavefront measurement and optimization," Proc. SPIE 6704, Advances in Metrology for X-Ray and EUV Optics II, 670403 (1 October 2007); https://doi.org/10.1117/12.732339