Intensity distribution of a capillary-discharge 46.9 nm soft X-ray laser |
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Authors: | Yongpeng Zhao Han Wu Yao Xie Shan Jiang Huaiyu Cui Qi Wang |
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Institution: | 1. Harbin Institute of Technology, National Key Laboratory of Tunable Lasers, Harbin, 150080, P. R. China 2. Chinese Academy of Sciences, Changchun Institute of Optics and Fine Mechanics, State Key Laboratory of Applied Optics, Changchun, 130033, P. R. China
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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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