title: Efficient output coupling of intracavity high-harmonic generation.
abstract: We demonstrate a novel technique for coupling extreme-ultraviolet (XUV) harmonic radiation out of a femtosecond enhancement cavity. We use a small-period diffraction grating etched directly into the surface of a dielectric mirror. For the fundamental light, this element acts as a high reflector. For harmonic wavelengths, it acts as a diffraction grating, coupling XUV radiation out of the cavity. Using this method, we observed the third through twenty-first odd harmonics with a dramatic increase in usable power over previous results of high-harmonic generation at high repetition rates.
authors.affiliation: JILA, National Institute of Standards and Technology and University of Colorado, Department of Physics, University of Colorado, Boulder, Colorado 80309-0440, USA. dylan.yost@colorado.edu
authors.forename: D C
authors.initials: DC
authors.lastname: Yost
authors.forename: T R
authors.initials: TR
authors.lastname: Schibli
authors.forename: Jun
authors.initials: J
authors.lastname: Ye