Research on X-ray emission from highly ionized ions produced by a ultra-high power laser irradiation

用高分辨光谱仪测量了原子序数从6到82的各种原子序数材料的强激光等离子体的X射线谱。我们还估算了用同步加速器校准的探测器的绝对X射线通量，从而判断了其应用的可能途径。我们研究了不同原子序数材料的X射线发射光谱的标度，并报道了同时放大的类氢钠（Na）和氟（F）Balmer-alpha线（波长分别为5.42和8.10 nm），增益乘积为-4。将30 J/20 ps/0.53 μ m的激光脉冲线聚焦到6.3 mm长、50 μ m宽和400 nm厚的氟化钠（NaF）条形靶上，辐照度为5 × 10 ^<14>W/cm ^2。用交叉校准的在轴和离轴谱仪测得的Na和F巴耳末α谱线的时间和空间积分增益系数均为5.9cm ~<-1>（-1）。空间分辨的轴上光谱仪表明，F线的空间峰强度位于离原靶面50 μ m-200 μ m处，而Na线的空间峰强度在0 μ m-100 μ m处，这与流体动力学计算定性一致。还用分辨力大于2100的高分辨光谱仪测量了氟放大线的精细结构强度比。

We measured the x-ray spectra from intense laser produced plasmas of various atomic number materials such as atomic number form 6 to 82 using a high resolution spectrometer. We also estimated absolute x-ray flux using a detector which was calibrated a synchrotoron machine leading to judge the possible way of its applications. We are investigating the scaling of the x-ray emission spectra from various atomic number materials precisely.We also report simultaneous amplification of hydrogen-like sodium (Na) and fluorine (F) Balmer-alpha lines (wavelengths: 5.42 and 8.10 nm, respectively) having gainlength product of -4. A30J/20ps/0.53 mum laser pulse was line focused on to a 6.3 mm long, 50mum wide and 400nm-thick sodium-fluoride (NaF) stripe target, at an irradiance of 5X10^<14> W/cm^2. The time and space-integrated gain coefficients measured with cross calibrated on-and off-axis spectrometers are 5.9cm^<-1> for both Na and F Balmer-alpha lines. The space resolved on-axis spectrometer shows that the spatial peak intensity of the F line is located 50mum-200mum away from the original target surface while that of Na is 0mum-100mum which agrees qualitatively with the hydrodynamic calculations. The fine structure intensity ratio of a fluorine amplified line was also measured with the high resolution spectrometer having a resolving power of more than 2100.