软X射线发射阈值附近强飞秒laser脉冲与氩微滴相互作用的研究
The interaction of intense femtosecond laser pulses with argon microdroplets studied near the soft x-ray emission threshold
摘要：
研究了近红外强激光脉冲作用下微氩液滴的极紫外等离子体发射。在10^14 W/cm ^2的激光强度下，记录到了来自热致密物质靶的发射，其光谱范围在16 ~ 30 nm之间。在发射阈值以上，软X射线辐射随脉冲能量呈指数增加，由此观察到产率对脉冲持续时间的强烈依赖性，其指向通过逆韧致辐射对微等离子体的有效电子碰撞加热。伴随的流体动力学模拟揭示了微等离子体条件的时间和空间发展。测量和计算的发射光谱以及提取的电子温度之间的良好协议确认，流体动力学模拟可以应用于强激发液滴的分析。
英文摘要：
The extreme ultraviolet plasma emission from liquid microsized argon droplets exposed to intense near-infrared laser pulses has been investigated. Emission from the warm dense matter targets is recorded in a spectral range in between 16 and 30 nm at laser intensities of 10^14 W/cm^2. Above the emission threshold, soft x-ray radiation exponentially increases with the pulse energy whereby a strong dependence of the yields on the pulse duration is observed, which points at an effective electron collisional heating of the microplasma by inverse bremsstrahlung. Accompanying hydrodynamic simulations reveal the temporal and spatial development of the microplasma conditions. The good agreement in between the measured and calculated emission spectra as well as the extracted electron temperatures confirm that hydrodynamic simulations can be applied in the analysis of strongly excited droplets.
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