@article{12083,
  author = {David Couch and Daniel Hickstein and Sterling Backus and David Winters and Matt Kirchner and Scott Domingue and Jessica Ramirez and Charles Durfee and Margaret Murnane and Henry Kapteyn},
  title = {Ultrafast 1 MHz vacuum-ultraviolet source via highly cascaded harmonic generation in negative-curvature hollow-core fibers},
  abstract = {We demonstrate the efficient generation of vacuum ultraviolet light at MHz 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 ~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 ~10 W 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 vacuum ultraviolet source can significantly enhance the capabilities of high-resolution photoelectron spectroscopies of molecular and quantum materials, such as photoionization mass spectrometry or time , angle , and spin-resolved photoemission.},
  year = {2020},
  journal = {Optica},
  volume = {7},
  chapter = {832},
  pages = {832},
  month = {2020-01},
  url = {https://www.osapublishing.org/optica/abstract.cfm?uri=optica-7-7-832},
  doi = {10.1364/OPTICA.395688},
}