Noncollinear Enhancement Cavity for Record-High Out-Coupling Efficiency of an Extreme-UV Frequency Comb

Authors

Chuankun Zhang, University of Colorado Boulder
Stephen B. Schoun, University of Colorado Boulder
Christoph M. Heyl, University of Colorado Boulder
Gil Porat, University of Colorado Boulder
Mette B. Gaarde, Louisiana State University
Jun Ye, University of Colorado Boulder

Document Type

Article

Publication Date

8-28-2020

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 600 μW, 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.

Publication Source (Journal or Book title)

Physical Review Letters

Recommended Citation

Zhang, C., Schoun, S., Heyl, C., Porat, G., Gaarde, M., & Ye, J. (2020). Noncollinear Enhancement Cavity for Record-High Out-Coupling Efficiency of an Extreme-UV Frequency Comb. Physical Review Letters, 125 (9) https://doi.org/10.1103/PhysRevLett.125.093902