Research on table-top plasma soft x-ray lasers

台式等离子体软X射线激光器的研究

• 批准号: 06680447
• 负责人: DAIDO Hiroyuki
• 金额: $ 1.41万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06680447/
• 关键词: Lase-Plasma; Soft X-Ray Lasers; Highly Ionized Ions; Line Focus; Neon-Like Ions; Nickel-like Ions; Electron-Collisiona Excitation; High-Power Lasers

In 1994, we have obtained the significant improvement of a lasing performance using double pulse pumping with a curved slab target at 19.6 nm wavelength of neon-like germanium J=0-1 line. The double pulses of 100 ps individual pulse width separated by 300 ps with a total energy of 300 J results in a soft x-ray beam of 12 times higher peak intensity with a smaller beam divergence of 2 mrad compared with those produced by the 1 ns single pulse pumping with 1.1 kJ energy.In 1995, we have demonstrated efficient soft x-ray lasing in nickel-like lanthanide elements (Nd, Sm, Gd, Tb and Dy) covering the spectral range between 6 nm and 8 nm. A curved slab target was pumped by 1.053 mum-wavelength multiple laser pulses ; two or three 100 ps duration pulses separated by 400 ps. A gain coefficient of 3.1 cm-1 and a gain-length product of 7.8 have been achieved at 7.97 mn in the Nd ions with 250 J pumping energy on a 2.5 cm length target. Possibility for further reduction of the pumping energy is discussed. We have also demonstrated efficient soft x-ray lasing in nickel-lik-elements i.e., Ag through Ta covering the spectral range between 14.3nm and 4.4 nm. A curved slab target was pumped by 1.053 mum-wavelength quadruple laser pulses ; the pulse to pulse separation for the first 3 pulses was 400 ps and that between the third and the fourth pulses was 1.6 ns, respectively. Each pulse duration and irradiances on a target were 100 ps and -7 * 10^<13> W/cm^2 for low atomic number elements and -2 * 10^<14> W/cm^2 for high atomic number elements, respectively. A gain coefficient of 2 cm^<-1> and a gain-length product of 5 have been achieved at 11 nm and 14 nm wavelengths for the Te and Ag lasers.

1994年，我们用双脉冲抽运，在19.6nm波长的类锗J=0-1谱线上获得了显著的激光性能改善。与能量为1.1kJ的1 ns单脉冲泵浦产生的软X射线束相比，100 ps单脉冲宽度间隔为300 ps，总能量为300 J的双脉冲产生的软X射线束的峰值强度高12倍，光束发散角小2 mrad。我们已经证明了在镍类镧系元素（Nd、Sm、Gd、Tb和Dy）中有效的软X射线激光，其覆盖了6 nm和8 nm之间的光谱范围。用1.053 μ m波长的多脉冲激光泵浦弯曲平板靶，两个或三个100 ps的脉冲间隔为400 ps。在2.5cm长的靶上，用250 J的泵浦能量，在7.97nm处获得了3.1cm ~（-1）的增益系数和7.8的增益长度积。进一步降低泵浦能量的可能性进行了讨论。我们还证明了在镍类元素中有效的软X射线激光，Ag到Ta覆盖14.3nm和4.4nm之间的光谱范围。弯曲板状靶被1.053 μ m波长的四重激光脉冲泵浦，前3个脉冲的脉冲间隔为400 ps，第三和第四个脉冲之间的脉冲间隔分别为1.6 ns。对于低原子序数元素，每个脉冲持续时间和靶上的辐照度分别为100 ps和-7 * 10^<13>W/cm ^2，<14>对于高原子序数元素，为-2 * 10^ W/cm ^2。在<-1>11 nm和14 nm波长处，碲和银激光器的增益系数为2 cm-3，增益长度积为5。

项目成果

H. Daido, 他: "Significant improvement in the efficiency and brightness of the J=0-1 19.6nm line of the germanium laser by use of double-pulse pumping-" Optics Letters. 20. 61-63 (1995)

H. Daido 等人：“通过使用双脉冲泵浦，显着提高了锗激光器 J=0-1 19.6 nm 线的效率和亮度”《光学快报》20. 61-63 (1995)。

H.Daido: "Subnanosecond In-line Soft X-Ray Holography Using Germanium Laser in the 20nm Wavelength Region" Journal of X-Ray Science and Technology. 5. 105-120 (1995)

H.Daido：“在 20nm 波长区域使用锗激光器的亚纳秒在线软 X 射线全息术”X 射线科学与技术杂志。

H.Daido et al.: "Efficient Soft X-Ray Lasing at 6 to 8 nm with Nickel-like Lan thanide Ions" Physical Review Letters. Vol.75. 1074-1077 (1995)

H.Daido 等人：“使用类镍 Lan 金属离子在 6 至 8 nm 处进行高效软 X 射线激光”物理评论快报。

H.Daido: "Significant improvement in the efficiency and bnghtness of the J=0-1 19.6nm line of the germanium laser by use of double-pulsepamping" Optics Letters. 20. 61-63 (1995)

H.Daido：“通过使用双脉冲放大，显着提高了锗激光器 J=0-1 19.6nm 线的效率和宽度”光学快报。

H.Daido: "Subnanosecond In-Line Soft X-Ray Holography Using Germamican Laser in the 20mm Wavelength Region" Journal of X-Ray Science and Technology. 5. -16 (1995)

H.Daido：“在 20mm 波长区域使用 Germamican 激光进行亚纳秒在线软 X 射线全息术”X 射线科学与技术杂志。