@article{2084, keywords = {pfc}, author = {D. Yost and Thomas Schibli and Jun Ye}, 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.}, year = {2008}, journal = {Optics Letters}, volume = {33}, pages = {1099}, month = {2008-05}, issn = {0146-9592}, url = {https://opg.optica.org/ol/fulltext.cfm?uri=ol-33-10-1099&id=159686}, doi = {10.1364/OL.33.001099}, }