12 October 2007 Characterization of an OFI seeded soft x-ray laser
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Abstract
Since the first seeding of an OFI soft x-ray laser in 2004, we progressed towards the full characterization of the output beam. The final is to be able to deliver to users well-known beam. Temporal as well as spatial parameters have been measured for different conditions of amplification. We observed a strong enhancement of the spatial coherence due to the amplification process with a far-field pattern exhibiting an airy-like shape. The gain zone having strong discontinuity behaves like a hard pinhole. Spatial filtering has been also observed on the wave front (δ/5 root-mean-square, rms, before seeding and δ/20 rms after amplification). Temporal coherence has been studied thanks to the use of a Fourier- Transform spectrometer. Spectral widths, δδ/δ, around 10-5 have been measured for different plasma lengths or gas pressures. Departure from Gaussian shape has been clearly observed on the spectral line for some cases.
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Ph. Zeitoun, S. Sebban, J. P. Goddet, F. Bridou, F. Burgy, B. Cros, D. Douillet, J. Gautier, O. Guillbaud, G. Jamelot, D. Joyeux, S. Kazamias, A. Klisnick, G. Maynard, A. S. Morlens, D. Phalippou, T. Lefrou, D. Ros, J. P. Rousseau, "Characterization of an OFI seeded soft x-ray laser", Proc. SPIE 6702, Soft X-Ray Lasers and Applications VII, 670209 (12 October 2007); doi: 10.1117/12.731002; https://doi.org/10.1117/12.731002
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