Plasmon-Enhanced-Attosecond-Extreme Ultraviolet Source

A compact high repetition rate attosecond light source based on a standard laser oscillator combined with plasmonic enhancement is analyzed. At repetition rates of tens of MHz, we predict focusable pulses with durations of <= 300 as and a spherical wave front at collimation angles <= 5 degrees. Plasmonic mode and guiding of the attosecond radiation determine the beam parameters. The beam is robust with respect to variations of driver pulse focus and duration.