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，我们使用双脉冲泵浦和弯曲板靶在19.6 nm波长的氖锗J=0-1线下获得了激光性能的显着改善。与 1.1 kJ 能量的 1 ns 单脉冲泵浦产生的软 X 射线束相比，间隔 300 ps 的 100 ps 单脉冲宽度、总能量为 300 J 的软 X 射线束的峰值强度高出 12 倍，光束发散度更小 2 mrad。 1995 年，我们证明了在镍类稀土元素（Nd、Sm、 Gd、Tb 和 Dy) 覆盖 光谱范围在 6 nm 至 8 nm 之间。弯曲板状靶材由1.053μm波长的多重激光脉冲泵浦；两个或三个 100 ps 持续时间的脉冲，间隔 400 ps。在 2.5 cm 长度的目标上，在 250 J 泵浦能量下，Nd 离子在 7.97 mn 处实现了 3.1 cm-1 的增益系数和 7.8 的增益长度积。讨论了进一步减少泵浦能量的可能性。我们还展示了类镍元素（即 Ag 到 Ta）中有效的软 X 射线激光，覆盖 14.3 nm 至 4.4 nm 的光谱范围。弯曲板状靶材由1.053μm波长四倍激光脉冲泵浦；前 3 个脉冲的脉冲间隔为 400 ps，第三个和第四个脉冲之间的脉冲间隔分别为 1.6 ns。目标上的每个脉冲持续时间和辐照度对于低原子序数元素分别为100 ps和-7 * 10^<13> W/cm^2，对于高原子序数元素分别为-2 * 10^<14> W/cm^2。对于Te和Ag激光器，在11nm和14nm波长处已经实现了2cm 2 -1的增益系数和5的增益长度乘积。

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。