21 October 1999 Efficient soft x-ray lasing at wavelengths of 20 to 30 nm
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Intense lasing at 18.9, 20.3 and 28.5 nm from nickel-like molybdenum, niobium and neon-like chromium ions has been observed by using two 200 ps laser pulses with a total energy of 50 J at 1.053 micrometers from XingGuang II laser facility. This shows the possibility of extending nickel- like and neon-like x-ray lasing in low-Z elements and paves the way towards small scale x-ray lasers for applications at university laboratories. A comparison has been made of performance of the neon-like chromium soft x-ray lasing at 28.5 nm driven by a double 900 ps pulse at 6 TW(DOT)cm-2, with that driven by a double 200 ps pulse at similar irradiance. The double 200 ps pulse has been found to be more efficient to drive the neon-like x-ray lasing.
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Jie Zhang, Y. Q. Gu, Yinjun Li, Yutong Li, Shutai Chun-Yu, Y. L. You, WenZhong Huang, S. T. He, Y. L. He, L. Z. Lu, Xiaodong Yuan, XiaoFeng Wei, Chuanfei Zhang, "Efficient soft x-ray lasing at wavelengths of 20 to 30 nm", Proc. SPIE 3776, Soft X-Ray Lasers and Applications III, (21 October 1999); doi: 10.1117/12.366657; https://doi.org/10.1117/12.366657

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