Abstract
We realize a Ne-like Ar 46.9 nm soft X-ray laser pumped by a capillary discharge. The study of the laserpulse-intensity distribution is important for applications of soft X-ray lasers. The intensity distribution demonstrates the gain distribution, plasma radius, and axial plasma density that contribute to the study of the laser-pulse formation. To measure the intensity in different positions of the X-ray laser spot, we moved transversally an X-ray diode (XRD) assembled with a slit. We obtain the onedimensional intensity distribution. We find a laser divergence (FWHM) of 4.0 mrad. According to the gain-guided model, we calculate the intensity distribution. The measured divergence of 4.0 mrad roughly corresponds to a plasma radius a approximately equal to 230–250 μm and on-axis electron density n e ≈ 8.0∙1018 −9.0∙1018 cm−3. The results of calculations indicate that the divergence of the intensity distribution increases when the plasma radius decreases and the on-axis electron density increases.
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Manuscript submitted by the authors in English on December 29, 2012.
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Zhao, Y., Wu, H., Xie, Y. et al. Intensity distribution of a capillary-discharge 46.9 nm soft X-ray laser. J Russ Laser Res 34, 219–225 (2013). https://doi.org/10.1007/s10946-013-9344-9
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DOI: https://doi.org/10.1007/s10946-013-9344-9