论文标题
频谱可调节的超舒服单色极端紫外线脉冲在100 kHz处
Spectrally tunable ultrashort monochromatized extreme ultraviolet pulses at 100 kHz
论文作者
论文摘要
我们介绍了可调节的，超短的，准单色的极端紫外线（XUV）脉冲，该脉冲以100 kHz的重复速率以用户为导向的气体高谐波发电（GHHG）梁的极端光基础设施 - 极光基础设施 - attosecond Light Pulse pulse（Elii Alps）设施。 Xuv脉冲的多功能光谱和时间塑形是通过双层延迟的补偿单色器来完成的，可容纳小说不对称的几何形状中的两个构图阶段。这种配置支持高单色XUV通量（2.8 +/- 0.9*1E10光子/s，在39.7 eV中选择使用700 MEV FWHM带宽）与超持续脉冲持续时间（4.0 +/- 0.2 fs fluss drive drive drive drive脉冲）和小脉冲脉冲（4.0 +/- 0.2 fs）。研究了所产生的辐射的聚焦性，光谱带宽和整体光子通量，涵盖了广泛的仪器构型。此外，已经使用Ptychographic算法在实验记录的XUV-IR泵送痕迹上实现了几秒钟单色XUV脉冲的完整时间（强度和相）表征。提出的结果有助于访问有关新型目标材料电子结构动力学的直接信息的原位，时间分辨的实验。
We present the experimental realization of spectrally tunable, ultrashort, quasi-monochromatic extreme ultraviolet (XUV) pulses generated at 100 kHz repetition rate in a user-oriented gas high harmonic generation (GHHG) beamline of the Extreme Light Infrastructure - Attosecond Light Pulse Source (ELI ALPS) facility. Versatile spectral and temporal shaping of the XUV pulses are accomplished with a double-grating, time-delay compensated monochromator accommodating the two composing stages in a novel, asymmetrical geometry. This configuration supports the achievement of high monochromatic XUV flux (2.8+/-0.9*1e10 photons/s at 39.7 eV selected with 700 meV FWHM bandwidth) combined with ultrashort pulse duration (4.0+/-0.2 fs using 12.1+/-0.6 fs driving pulses) and small spot size (sub-100 um). Focusability, spectral bandwidth, and overall photon flux of the produced radiation were investigated covering a wide range of instrumental configurations. Moreover, complete temporal (intensity and phase) characterization of the few-femtosecond monochromatic XUV pulses - a goal that is difficult to achieve by conventional reconstruction techniques - has been realized using ptychographic algorithm on experimentally recorded XUV-IR pump-probe traces. The presented results contribute to in-situ, time-resolved experiments accessing direct information on the electronic structure dynamics of novel target materials.
