Eur. Phys. J. AP
Volume 20, Number 3, December 2002ACO: Action Coordonnée Optique
|Page(s)||197 - 203|
|Section||Laser, Optics, Optoelectronics and Nanophotonics|
|Published online||15 November 2002|
Wavefront measurements in the soft X-ray range
Laboratoire de Spectroscopie Atomique et Ionique, Bât. 350, Université Paris-Sud, 91405
2 Department of Electrical and Computer Engineering, Colorado State University, Fort Collins, CO 80523-1373, USA
3 Institut d'Électronique et de Microélectronique du Nord, Université des Sciences et Technologie de Lille, avenue Poincaré, BP 69, 59652 Villeneuve d'Ascq, France
Corresponding author: firstname.lastname@example.org
Revised: 28 May 2002
Accepted: 7 June 2002
Published online: 15 November 2002
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 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.
PACS: 42.55.Vc – X- and γ-ray lasers / 41.50.+h – X-ray beams and X-ray optics / 52.58.Lq – Z-pinches, plasma focus and other pinch devices
© EDP Sciences, 2002
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