摘要
Soft X-ray laser gain experiments were successfully carried out to test recombination pumping scheme at the 6-beam laser facility and the LF12 laser facility of Shanghai Institute of Optics and Fine Mechanics, Academia Sinica. Amplifications of soft X-ray spontaneous emission (ASE) have been observed in Li-likealuminium and silicon ions in plasmas produced by irradiation of slab targets with line-focused lasers. Time-integrated intensities of the Li-like aluminum and silicon ion spectral lines emitted along the axis of the plasma show that the intensities of the spectral lines for Al^(10+) 5f—3d (105.7) and Si^(11+)+5f—3d (88.9) and 5d—3p (87.3) transitions increase nonlinearly with plasma lengths, and the corresponding gain coefficients are 3.1±0.9, 1.5±0.5, and 1.4±0.5cm^(-1), respectively, the maximum gain-length product being about 2.5. These results were obtained at much lower intensity of driving laser, 1.5—2.0×10^(12)W/cm^2.
Soft X-ray laser gain experiments were successfully carried out to test recombination pumping scheme at the 6-beam laser facility and the LF12 laser facility of Shanghai Institute of Optics and Fine Mechanics, Academia Sinica. Amplifications of soft X-ray spontaneous emission （ASE） have been observed in Li-likealuminium and silicon ions in plasmas produced by irradiation of slab targets with line-focused lasers. Time-integrated intensities of the Li-like aluminum and silicon ion spectral lines emitted along the axis of the plasma show that the intensities of the spectral lines for Al<sup>10+</sup> 5f—3d （105.7） and Si<sup>11+</sup>+5f—3d （88.9） and 5d—3p （87.3） transitions increase nonlinearly with plasma lengths, and the corresponding gain coefficients are 3.1±0.9, 1.5±0.5, and 1.4±0.5cm<sup>-1</sup>, respectively, the maximum gain-length product being about 2.5. These results were obtained at much lower intensity of driving laser, 1.5—2.0×10<sup>12</sup>W/cm<sup>2</sup>.
基金
Project supported by the National High Technology Program, the National Natural Science Foundation of China and the Significant Scientific Project of the Chinese Academy of Sciences.
