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

基本信息

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

项目摘要

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，我们使用双脉冲泵泵在19.6 nm波长的霓虹灯样锗j = 0-1线上获得了激光性能的显着改善。 100 ps个体脉冲宽度的双脉冲分别为300 ps，总能量为300 j，导致X射线束高12倍，峰值强度高12倍，而较小的梁发散为2 mrad，而1 ns产生的束则是2 mrad。单个脉冲泵送以1.1 kJ的能量泵送。在1995年，我们在镍样灯笼元素（ND，SM，GD，TB和DY）中表现出有效的软X射线激光，覆盖了6 nm和8 nm之间的频谱范围。弯曲的平板靶由1.053个妈妈波长多个激光脉冲泵送；两个或三个100 ps持续时间脉冲分别为400 ps。在ND离子中，在2.5 cm长度目标的ND离子中，在ND离子中，增益系数为3.1 cm-1，增益长度为7.8。讨论了进一步减少抽水能的可能性。我们还展示了在镍类元素中有效的软X射线激光，即通过TA覆盖14.3nm至4.4 nm之间的Ag。弯曲的平板靶由1.053个妈妈波长四倍激光脉冲泵送；前3个脉冲的脉冲分离为400 ps，第三个脉冲和第四脉冲之间分别为1.6 ns。对于低原子数元素，目标的每个脉冲持续时间和辐照均为100 ps和-7 * 10^<13> w/cm^2，对于高原子数元素，-2 * 10^<14> w/cm^2分别。对于TE和Ag激光器，在11 nm和14 nm波长下，已经实现了2 cm^<-1>的增益系数，增益长度为5。