Ultrafast 1 MHz vacuum-ultraviolet source via highly cascaded harmonic generation in negative-curvature hollow-core fibers
Ultrafast 1 MHz vacuum-ultraviolet source via highly cascaded harmonic generation in negative-curvature hollow-core fibers
复制标题
DOI：
10.1364/optica.395688
复制
发表时间：
2020-07-20
期刊：
影响因子：
10.4
通讯作者：
Kapteyn, Henry C.
中科院分区：
文献类型：
--
作者：
Couch, David E.;Hickstein, Daniel D.;Kapteyn, Henry C.
真空 - 硫酸盐（VUV）的光对于研究分子和材料的研究至关重要，但是事实证明，以高重复速率以高重复速率在VUV地区产生的飞秒脉冲很困难。在这里，我们证明了使用高脱层的空心核纤维中高度级联的四波混合过程，以梅加赫兹重复率的有效产生。直到第15个谐波（69 nm，18.0 eV），两种均匀的谐波都会产生，高能分辨率与40 MEV相似。与直接高谐波生成相反，这种高度级联的谐波生成过程需要较低的峰强度，因此可以以较高的重复速率运行，这是由与紧凑型设置相似的强大启动的，类似于10W的纤维激光系统。此外，我们提供了数值模拟，以探讨高级联谐波产生的基本功能和时空动力学。该VUV源可以增强分子和量子材料的光谱的能力，例如光电离质谱法以及时间，角度和自旋分辨光发射。 （c）2020年美国光学学会根据OSA开放访问发布协议条款
Vacuum-ultraviolet (VUV) light is critical for the study of molecules and materials, but the generation of femtosecond pulses in the VUV region at high repetition rates has proven difficult. Here we demonstrate the efficient generation of VUV light at megahertz repetition rates using highly cascaded four-wave mixing processes in a negative-curvature hollow-core fiber. Both even-and odd-order harmonics are generated up to the 15th harmonic (69 nm, 18.0 eV), with high energy resolution of similar to 40 meV. In contrast to direct high harmonic generation, this highly cascaded harmonic generation process requires lower peak intensity and therefore can operate at higher repetition rates, driven by a robust similar to 10W fiber-laser system in a compact setup. Additionally, we present numerical simulations that explore the fundamental capabilities and spatiotemporal dynamics of highly cascaded harmonic generation. This VUV source can enhance the capabilities of spectroscopies of molecular and quantum materials, such as photoionization mass spectrometry and time-,angle-, and spin-resolved photoemission. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement