Formation of Intense Attosecond Pulses in the Sequence of a Resonant Absorber and Active Medium of a Plasma-Based X-Ray Laser Modulated by an Optical Field
Formation of Intense Attosecond Pulses in the Sequence of a Resonant Absorber and Active Medium of a Plasma-Based X-Ray Laser Modulated by an Optical Field
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DOI：
10.1007/s11141-021-10130-7
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发表时间：
2021-09
影响因子：
0.8
通讯作者：
I. Khairulin;V. Antonov;O. Kocharovskaya
中科院分区：
文献类型：
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作者：
I. Khairulin;V. Antonov;O. Kocharovskaya
研究了在由共振吸收体（类氢离子等离子体）和等离子体基X射线激光器的激活介质（激发态相同离子的等离子体）组成的系统中，将准单色种子X射线辐射转换为阿秒脉冲序列的可能性。在这种情况下，脉冲的形成发生在调制的吸收体中，而活性介质用于其随后的放大。结果表明，这种方法显着增加了脉冲的能量，并改善其形状相比，直接在调制的活性介质的X射线激光脉冲形成。得到的解析解表明，脉冲形成调制吸收体是由于存在的谐振辐射，它在介质中传播没有吸收的多频结构。它示出，分析和数值，脉冲的光谱-时间特性是不敏感的每个介质（吸收和放大）的光学厚度的变化在很宽的范围内。示出了在类氢C5+离子的等离子体中形成具有3.4nm量级的波长、具有小于200 As的持续时间和超过1013 W/cm 2的峰值强度的X射线脉冲的可能性。
We study the possibility of transforming quasi-monochromatic seeding X-ray radiation into an attosecond pulse train in the system composed of a resonant absorber (the plasma of hydrogen-like ions) and an active medium of a plasma-based X-ray laser (the plasma of identical ions in the excited state), which are modulated by the same optical field. In this case, the formation of pulses occurs in a modulated absorber, while the active medium is used for their subsequent amplification. It is shown that this approach significantly increases the energy of the pulses and improves their shape in comparison with the pulse formation directly in the modulated active medium of an X-ray laser. The obtained analytical solution shows that the pulse formation in the modulated absorber is due to the existence of a multifrequency structure of the resonant radiation, which propagates in the medium without absorption. It is shown, both analytically and numerically, that the spectral–temporal characteristics of the pulses are insensitive to changes in the optical thickness of each medium (absorbing and amplifying) over a wide range. The possibility of forming X-ray pulses with a wavelength of the order of 3.4 nm, having a duration of less than 200 as and a peak intensity exceeding 1013W/cm2, in the plasma of hydrogen-like C5+ions is shown.