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Wavefront measurements in the soft X-ray range

Published online by Cambridge University Press:  15 November 2002

S. Le Pape
Affiliation:
Laboratoire de Spectroscopie Atomique et Ionique, Bât. 350, Université Paris-Sud, 91405 Orsay, France
Ph. Zeitoun*
Affiliation:
Laboratoire de Spectroscopie Atomique et Ionique, Bât. 350, Université Paris-Sud, 91405 Orsay, France
M. Idir
Affiliation:
Laboratoire de Spectroscopie Atomique et Ionique, Bât. 350, Université Paris-Sud, 91405 Orsay, France
P. Dhez
Affiliation:
Laboratoire de Spectroscopie Atomique et Ionique, Bât. 350, Université Paris-Sud, 91405 Orsay, France
D. Ros
Affiliation:
Laboratoire de Spectroscopie Atomique et Ionique, Bât. 350, Université Paris-Sud, 91405 Orsay, France
A. Carillon
Affiliation:
Laboratoire de Spectroscopie Atomique et Ionique, Bât. 350, Université Paris-Sud, 91405 Orsay, France
J. J. Roca
Affiliation:
Department of Electrical and Computer Engineering, Colorado State University, Fort Collins, CO 80523-1373, USA
M. François
Affiliation:
Institut d'Électronique et de Microélectronique du Nord, Université des Sciences et Technologie de Lille, avenue Poincaré, BP 69, 59652 Villeneuve d'Ascq, France
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Abstract

In this article we report a new wavefront sensor, developed at the Laboratoire de Spectroscopie Atomique et Ionique, for a full characterization of soft X-ray beams. The Shack-Hartmann sensor has a theoretical accuracy in the order of $\lambda/100$ at a wavelength around 13 nm. A cartography of the wave-vectors pointing of laser-pumped soft X-ray laser has been achieved. It has shown the presence of many ripples probably coming from plasma instabilities. Capillary discharge soft X-ray laser has been also investigated. For all the pumping configurations, the wavefront is spherical, divergent with a radius of about 6.5 m at 2.5 m from the plasma end. The best wavefront exhibits an error to a perfect wave of 3λ rms. Assuming to focus the beam with a f = 50 mm diffraction-limited mirror, a theoretical focal spot size of 0.5 μm in diameter have been estimated containing 70% of the incident energy. In that case an intensity of 4 × 1013 W cm−2 should be achieved.

Keywords

Type
Research Article
Copyright
© EDP Sciences, 2002

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References

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