JILA/University of Colorado-Boulder
Wednesday, February 1, 2012
We generate high order harmonics of a femtosecond frequency comb at the focus of a high-finesse optical cavity with 154 MHz repetition rate. The resulting tabletop high brightness extreme ultraviolet (XUV) light source has promising applications in XUV frequency metrology, strong field and molecular physics studies, and more traditional XUV applications currently served by synchrotron facilities. I will discuss our recent results of XUV yields greater than 200 microWatt per harmonic and the first direct frequency comb spectroscopy in the extreme ultraviolet, allowing MHz resolution of atomic lines at 82 nm and 63 nm with intrinsic absolute frequency calibration. With these developments, XUV spectroscopy has left the "light bulb" age.