Hybridly pumped collisional soft X-ray laser in Ne-like sulphur
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We describe an experiment demonstrating XUV amplification following collisional excitation in a discharge-created plasma waveguide irradiated by a picosecond optical laser pulse. A capillary discharge was used to generate a plasma radiation pipe with a radially concave electron density profile. Temporally resolved transmission characteristics and guiding effect have been measured. An intense short laser pulse rapidly heated the electrons, producing amplification in the 3p1S0–3s 1P1 transition of Ne-like S at 60.84 nm. The integrated gain-length product obtained within a 3 cm active medium with ...