共查询到20条相似文献,搜索用时 156 毫秒
1.
钴、镍和铜离子的类钠件线谱 总被引:2,自引:1,他引:1
以激光辐照固体平面靶产生的高温等离子体作为辐射源,利用平晶x射线谱仪观测了钴、镍和铜的类氖离子2p-3d跃迁的长波类钠伴线x射线光谱。根据等电子数序规律外推,与观测波长值比较,给出了对这些伴线进行辨认的结果。 相似文献
2.
毛细管放电条件下类氖序列原子参量计算与分析 总被引:2,自引:0,他引:2
利用多组态求解相对论性的Hartree-Fock-Roothan方程(HFR)方法计算了类氖离子(Z=13~27)2s^22p^5—2s^22p^53s能级之间跃迁的原子参量,包括类氖氩激光系统的能级,振子强度,自发辐射衰变速率,能级寿命,电子碰撞激发截面及电子碰撞激发速率系数等。以类氖氩离子为例,分析了等离子体内46.9nm激光跃迁的粒子数反转的形成及谱线放大过程,讨论了其它几条谱线产生增益的可能性,分析了激光线振子强度随核电荷数的变化规律。根据获得的原子参量,计算了利用毛细管放电产生类氖氩和类氖氪x射线激光的放电参量,其中类氖氩毛细管放电的初始压强的范围为30~90Pa,放电电流峰值为10~50kA。理论计算结果为类氖氩x光激光实验分析,深入研究等离子体反转动力学,激光增益的估算及理论方案设计等提供了基本数据。 相似文献
3.
利用高分辩的高次衍射线方法,本文系统地分析了铜、硒激光等离子体的软x射线光谱及它与原子序数的关系,得到了比文献[1][2]更为精确、可靠的类钠离子软x射线波长和发射规律. 相似文献
4.
5.
6.
7.
8.
9.
重元素高电离的离子特性对研究激光核聚变和X射线激光等都很重要,本文用3d^94s,3d^94d,3d^94p,3d^94f组态相互作用研究了类镍铱离子光谱跃迁。 相似文献
10.
考察了激发态之间的电离与复合过程对等离子体状态的影响,并对其原因进行了细致的分析,分别考察了对1.0ns,100ps和5ps激光驱动的类氖锗19.6nm X射线激光增益系数的影响.研究表明,对于5ps激光驱动的瞬态机理X射线激光来讲,因增益区处在高密度区,所以,激发态之间的电离与复合过程对X射线激光将不可以忽略.对于1.0ns和100ps激光驱动的亚稳态机理X射线激光来讲,在电子密度小于等于5×1020cm-3的区域,忽略激发态之间的电离与复合使增益的时间半高全
关键词:
X射线激光
矩阵分块法
类氖锗
双电子激发态 相似文献
11.
Larotonda MA Wang Y Berrill M Luther BM Rocca JJ Shakya MM Gilbertson S Chang Z 《Optics letters》2006,31(20):3043-3045
We have measured the pulse duration of gain-saturated 13.9 nm Ni-like Ag and 13.2 nm Ni-like Cd transient collisional lasers excited by grazing-incidence-pumping for several pumping conditions. High-resolution streak-camera measurements yielded FWHM pulse durations close to 5 ps for both lasers under optimum pumping conditions. The very high brightness and short pulse duration of these new high repetition tabletop soft x-ray lasers make them an attractive source for dynamic applications. 相似文献
12.
We theoretically investigate a 13.9nm Ni-like Ag x-ray laser using a one-dimensional hydrodynamic code coupled with an atomic physics data package. The population inversion is transiently pumped by a grazing incident 0.5ps main pulse irradiating into an optimized plasma, which is generated by a normal incidence 300ps pulse and a subsequent grazing incidence 300ps pulse. The effect of the grazing-incidence angle on the source position of the output x-ray laser is investigated. Near zero deflecting angle is found for the peak output intensity of the Ni-like Ag x-ray lasers, with a small FWHM divergence of 5mrad. It is predicted that saturation can be achieved with a total pump energy of 165mJ. 相似文献
13.
类氖离子的X光激光理论研究可以为类镍X光激光提供有益启示。设计了一系列瞬态电子碰撞激发类氖锗19.6 nm X光激光的实验,采用2ω1ω泵浦方式,即预脉冲采用倍频钕玻璃激光,主脉冲采用基频,用新开发的瞬态电子碰撞激发类氖锗的系列程序进行了模拟,并与1ω1ω驱动的情况进行了比较。模拟表明, 2ω1ω泵浦方案使类氖锗19.6 nm X光激光的小信号增益系数增大为1ω1ω方案的1.6倍,增益区也转移到了更高的电子密度区,是获得更短波长X光激光的一种有效方法。 相似文献
14.
BA Reagan KA Wernsing AH Curtis FJ Furch BM Luther D Patel CS Menoni JJ Rocca 《Optics letters》2012,37(17):3624-3626
We demonstrate the operation of a gain-saturated table-top soft x-ray laser at 100?Hz repetition rate. The laser generates an average power of 0.15?mW at λ=18.9 nm, the highest laser power reported to date from a sub-20-nm wavelength compact source. Picosecond laser pulses of 1.5?μJ energy were produced at λ=18.9 nm by amplification in a Mo plasma created by tailoring the temporal intensity profile of single pump pulses with 1?J energy produced by a diode-pumped chirped pulse amplification Yb:YAG laser. Lasing was also obtained in the 13.9?nm line of Ni-like Ag. These results increase by an order of magnitude the repetition rate of plasma-based soft x-ray lasers opening the path to milliwatt average power table-top lasers at sub-20?nm wavelengths. 相似文献
15.
汤姆逊散射是诊断高温稠密等离子体状态参数的重要方法之一, 受到广泛的关注. 但是目前用于进行汤姆逊散射的探针光波长多局限于可见光或紫外光, 能够诊断的区域电子密度远低于驱动激光的临界密度. 相比较而言, 以软X射线激光作为探针, 有希望诊断更高密度区域的等离子体. 利用“神光Ⅱ”高功率激光装置产生的类氖锗软X射线激光作为探针, 开展了软X射线激光汤姆逊散射实验的尝试. 根据散射的条件, 分别进行了非相干散射和相干散射的实验, 但均未能获得明显的散射谱. 理论分析表明, 主要原因可能是实验中作为探针的类氖锗软 X射线激光的聚焦功率密度不够, 通过优化实验条件, 有希望在今后的研究中获得相干汤姆逊散射的结果.
关键词:
等离子体诊断
软X 射线激光
汤姆逊散射 相似文献
16.
17.
Weith A Larotonda MA Wang Y Luther BM Alessi D Marconi MC Rocca JJ Dunn J 《Optics letters》2006,31(13):1994-1996
We have generated a laser average output power of 2 microW at a wavelength of 13.9 nm by operating a tabletop laser-pumped Ni-like Ag laser at a 5 Hz repetition rate, using a solid helicoidal target that is continuously rotated and advanced to renew the target surface between shots. More than 2 x 10(4) soft-x-ray laser shots were obtained by using a single target. Similar results were obtained at 13.2 nm in Ni-like Cd with a Cd-coated target. This scheme will allow uninterrupted operation of laser-pumped tabletop collisional soft-x-ray lasers at a repetition rate of 10 Hz for a period of hours, enabling the generation of continuous high average soft-x-ray powers for applications. 相似文献
18.
Theoretical research on enhancement of gain for Ni-like Ag 13.9nm x-ray laser using a new two-layer target 下载免费PDF全文
For experiments such as on Ni-like Ag x-ray laser, driven by 1\omega
laser, the gain region is only several~nm depth near the target
surface, this paper proposes a new two-layer target, in which a thin
layer (several nm depth) of silver is plated on the surface of some
other materials. Furthermore, the Ni-like Ag 13.9~nm x-ray laser
produced by three new kinds of two-layer target with CH, Al and Ge as
foundation, was theoretically studied. 相似文献
19.
In most collisional schemes of x-ray laser (XRL) experiments, a
bow-like intensity distribution of XRL is often observed, and it is
generally ascribed to the two-dimensional hydrodynamic behaviour of
expanding plasma. In order to better understand its essence in
physics, a newly developed two-dimensional non-equilibrium radiation
hydrodynamic code XRL2D is used to simulate a quasi-steady state
Ni-like Ag XRL experiment on ShenGuang-II facility. The simulation
results show that the bow-like distribution of Ni-like ions caused by
over-ionization in the central area of plasma is responsible for the
bow-like shape of the XRL intensity distribution observed. 相似文献
20.
Dunn J Li Y Osterheld AL Nilsen J Hunter JR Shlyaptsev VN 《Physical review letters》2000,84(21):4834-4837
We have demonstrated small signal gain saturation on several transient-gain Ni-like ion x-ray lasers by using a high-power, chirped-pulse amplification, tabletop laser. These results have been achieved at wavelengths from 139-203 A using a total of 5-7 J energy in a traveling-wave excitation scheme. Strong amplification is also observed for Ni-like Sn at 119 A. Gain of 62 cm(-1) and gL product of 18 are determined on the 4d-->4p transition for Ni-like Pd at 147 A with an output energy of 12 &mgr;J. A systematic evaluation of the laser driver parameters yields optimum beam divergence and small deflection angles of 2-5 mrads, in good agreement with simulations. 相似文献