@article{12151,
  author = {Chuankun Zhang and Stephen Schoun and Christoph Heyl and Gil Porat and Mette Gaarde and Jun Ye},
  title = {Noncollinear Enhancement Cavity for Record-High Out-Coupling Efficiency of an Extreme-UV Frequency Comb},
  abstract = {We demonstrate a femtosecond enhancement cavity with a crossed-beam geometry for efficient generation and extraction of extreme-ultraviolet (XUV) frequency combs at a 154 MHz repetition rate. We achieve a record-high out-coupled power of 600μW, directly usable for spectroscopy, at a wavelength of 97 nm. This corresponds to a > 60% out-coupling efficiency. The XUV power scaling and generation efficiency are similar to that achieved with a single Gaussian-mode fundamental beam inside a collinear enhancement cavity. The noncollinear geometry also opens the door for the generation of isolated attosecond pulses at > 100 MHz repetition rate.},
  year = {2020},
  journal = {Physical Review Letters },
  volume = {125},
  chapter = {093902},
  pages = {093902},
  month = {2020-08},
  publisher = {American Physical Society},
  url = {https://link.aps.org/doi/10.1103/PhysRevLett.125.093902},
  doi = {10.1103/PhysRevLett.125.093902},
}