Müller Matthias, Kühl Frank-Christian, Großmann Peter, Vrba Pavel, Mann Klaus
Laser-Laboratorium Göttingen eV, Hans-Adolf-Krebs-Weg 1, D-37077 Göttingen, Germany.
Opt Express. 2013 May 20;21(10):12831-42. doi: 10.1364/OE.21.012831.
The influcence of the pulse duration on the emission characteristics of nearly debris-free laser-induced plasmas in the soft x-ray region (λ ≈ 1-5 nm) was investigated, using six different target gases from a pulsed jet. Compared to ns pulses of the same energy, a ps laser generates a smaller, more strongly ionized plasma, being about 10 times brighter than the ns laser plasma. Moreover, the spectra are considerably shifted towards shorter wavelengths. Electron temperatures and densities of the plasma are obtained by comparing the spectra with model calculations using a magneto-hydrodynamic code.
利用来自脉冲射流的六种不同靶气体，研究了脉冲持续时间对软X射线区域（λ≈1 - 5nm）中近无碎片激光诱导等离子体发射特性的影响。与相同能量的纳秒脉冲相比，皮秒激光产生的等离子体更小、电离更强，比纳秒激光等离子体亮约10倍。此外，光谱明显向更短波长偏移。通过将光谱与使用磁流体动力学代码的模型计算进行比较，获得了等离子体的电子温度和密度。
