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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >A comparative study of the inner-shell and the ionic line radiation from ultra-short laser-produced magnesium plasma
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A comparative study of the inner-shell and the ionic line radiation from ultra-short laser-produced magnesium plasma

机译：超短激光产生镁等离子体的内壳和离子线辐射的比较研究

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摘要

The inner-shell radiation (K-alpha) and the ionic line radiation (He-alpha) from magnesium plasma, generated by the interaction of a 3 TW, 45 fs laser, have been studied simultaneously using an x-ray crystal spectrograph. The effect of the variation of the laser intensity and its offset from the best focus position has been studied. He-alpha and K-alpha x-ray yields are found to scale with the laser intensity as I-L(1.5) and I-L(0.6) respectively. The K-alpha x-ray conversion shows a maximum at the best focus and reduces symmetrically on either side of the best focus position, whereas the He-a conversion peaks when the target is placed before the focused laser beam. The angular distribution for the He-alpha as well as the K-alpha emissions shows a maximum in the forward direction and the intensity reduces with the increase in angle. with respect to the target normal as cos(alpha)(theta). The value of a is 0.7 and 3 for He-alpha and K-alpha respectively. The experimentally observed variation of the He-alpha line conversion for different laser parameters has been explained by considering the change in preformed plasma conditions, and the variation in the K-alpha emission has been explained by considering hot electron generation and their propagation in the bulk solid target. The plasma conditions prevalent during the emission of the x-ray spectrum were identified by comparing the experimental spectra with the synthetic spectra generated using the spectroscopic analysis code PrismSPECT. The results will be useful in designing laser-produced plasma x-ray line radiation sources of photon energy in the range of 1-2 keV, for its potential use as a probe pulse in x-ray backlighting, or time-resolved x-ray diffraction studies.
机译：使用X射线晶体光谱仪同时研究了3 TW，45 fs激光相互作用产生的镁等离子体产生的内壳辐射（K-alpha）和离子线辐射（He-alpha）。研究了激光强度变化及其偏离最佳聚焦位置的影响。发现He-alpha和K-alpha的X射线产量分别与激光强度I-L（1.5）和I-L（0.6）成比例。 K-alpha X射线转换在最佳焦点处显示最大值，并且在最佳焦点位置的任一侧对称地减小，而当将目标放置在聚焦激光束之前时，He-a转换达到峰值。 He-alpha和K-alpha发射的角度分布在向前方向上显示最大值，并且强度随角度的增加而减小。相对于目标法线为cosα（theta）。对于He-alpha和K-alpha，a的值分别为0.7和3。实验中观察到的不同激光参数下He-alpha线转换的变化已通过考虑预先形成的等离子体条件的变化进行了解释，而K-alpha发射的变化已通过考虑热电子的产生及其在整体中的传播进行了解释坚实的目标。通过将实验光谱与使用光谱分析代码PrismSPECT生成的合成光谱进行比较，可以确定在X射线光谱发射期间普遍存在的等离子体条件。该结果对于设计激光产生的等离子X射线线辐射源的光子能量在1-2 keV范围内很有用，因为它有可能用作X射线背光或时间分辨X射线中的探测脉冲。衍射研究。

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