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Aberration-free laser beam in the soft x-ray range

Abstract : By seeding an optical-field-ionized population-inverted plasma amplifier with the 25th harmonic of an IR laser, we have achieved what we believe to be the first aberration-free laser beam in the soft x-ray spectral range. This laser emits within a cone of 1.34 mrad(1/e^2) at a repetition rate of 10 Hz at a central wavelength of 32.8 nm. The beam exhibits a circular profile and wavefront distortions as low as λ/17. A theoretical analysis of these results shows that this high beam quality is due to spatial filtering of the seed beam by the plasma amplifier aperture.
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Submitted on : Friday, August 6, 2010 - 5:20:47 PM
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Jean-Philippe Goddet, Stéphane Sebban, J. Gautier, Philippe Zeitoun, Constance Valentin, et al.. Aberration-free laser beam in the soft x-ray range. Optics Letters, Optical Society of America, 2009, 34 (16), pp.2438-2440. ⟨10.1364/OL.34.002438⟩. ⟨hal-00508899⟩



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