28 September 2009 Gain saturation in Ni-like lasers
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Abstract
We report on gain-saturated operation of the 4d → 4p, J = 0-1, 11.4-nm soft-x-ray laser line in Ni-like antimony (Sb) at a pump energy of only 2.5 J. The driving laser used was a 1054-nm Nd:glass CPA laser system with a pulse duration of 7 ps (FWHM). The pump beam was focused with a tilted on-axis parabolic mirror in a grazing-incidence (GRIP) pumping configuration at a grazing angle of 45°. For this angle, the length of the line focus attains a value of 19.6 mm (FWHM) for the 120-mm beam diameter used in these experiments. In addition, the excitation velocity of the intrinsic traveling wave increases to 1.41c and results in a temporal mismatch of ~20 ps at the output end of the target. As a consequence, care must be taken in interpreting the usual gain measurements (intensity-vs.-target length). A novel method to distinguish the different effects causing roll-off based on the second derivative of the intensity curve will be discussed.
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Jürg E. Balmer, Jürg E. Balmer, Christoph Imesch, Christoph Imesch, Felix Staub, Felix Staub, } "Gain saturation in Ni-like lasers", Proc. SPIE 7451, Soft X-Ray Lasers and Applications VIII, 74510O (28 September 2009); doi: 10.1117/12.828144; https://doi.org/10.1117/12.828144
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