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12 October 2007 Characterization of an OFI seeded soft x-ray laser
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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.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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, and 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;


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