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四波混合实验与极端紫外线的短暂格子

F Bencivenga¹, R Cucini¹, F Capotondi¹

¹Elettra-Sincrotrone Trieste, Strada Statale 14 km 163,5 in Area Science Park, I-34012 Basovizza, Trieste, Italy.

|April 10, 2015

概括

四波混合 (FWM) 现在在极端紫外线波长工作,使纳米级成像和元素选择性成为可能. 这一突破为研究超快速动态与前所未有的分辨率开辟了新的途径.

科学领域:

非线性光学和光谱学
超快的动力学超快的动力学
自由电子激光的应用

背景情况:

四波混合 (FWM) 是一种三级非线性工艺,提供超快的时间分辨率和选择性.
目前的FWM应用仅限于光学波长,限制了空间分辨率和元素分析.
将FWM扩展到更短的波长 (极紫外线/软X射线) 承诺提高分辨率和元素选择性.

研究的目的:

为了证明四波混合 (FWM) 在亚光波长的可行性.
利用由连贯的极紫外脉冲产生的短暂格子来刺激FWM.
为了使FWM信号的时间解析观测能够研究连贯的激发动态.

主要方法:

通过来自FERMI自由电子激光器的连贯极紫外线脉冲的干扰来产生短暂的网格.
使用这些短暂网,在亚光波长上刺激四波混合 (FWM) 过程.
时间分辨率检测FWM信号以观察动态过程.

主要成果:

成功刺激了在亚光波长的四波混合 (FWM) 过程.
观察了FWM信号的时间演变,揭示了像分子振动这样的连贯激发的动态.
以纳米空间分辨率和元素选择性展示了FWM的潜力.

结论:

四波混合 (FWM) 在极端紫外线波长下是可行的,克服了以前的限制.
这一进步为纳米尺度成像和超快动态的元素选择性研究铺平了道路.
结果支持先进的光子源的开发,并允许在诸如电荷转移动力学等领域进行新的研究.

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