Optimization of the wave front of high order harmonics
Julien Gautier
(1)
,
Philippe Zeitoun
(1)
,
C. Hauri
(1)
,
Anne-Sophie Morlens
(1)
,
G. Rey
(1)
,
C. Valentin
(1)
,
E. Papalarazou
(1)
,
Jean-Philippe Goddet
(1)
,
Stéphane Sebban
(1)
,
Frédéric Burgy
(1)
,
P. Mercere
(2)
,
Mourad Idir
(2)
,
Guillaume Dovillaire
(3)
,
Xavier Levecq
(3)
,
Samuel Bucourt
(3)
,
Marta Fajardo
(4)
,
H. Merdji
(5)
,
J.-P. Caumes
(5)
Philippe Zeitoun
- Function : Author
- PersonId : 4358
- IdHAL : philippe-zeitoun
- IdRef : 08195574X
C. Valentin
- Function : Author
- PersonId : 749586
- IdHAL : constance-valentin
- ORCID : 0000-0001-7519-3829
- IdRef : 197903657
Jean-Philippe Goddet
- Function : Author
- PersonId : 4337
- IdHAL : jean-philippe-goddet
- IdRef : 147945127
Stéphane Sebban
- Function : Author
- PersonId : 4406
- IdHAL : stephane-sebban
- IdRef : 095683410
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.