The Innoslab amplifier comprises a diode-laser partially end-pumped thin slab crystal and a
folded single-pass optical amplification path. While this configuration differs in many …

Ultrafast spectroscopy in the extreme ultraviolet demands for ever-higher pulse repetition
rates and photon energies. Here, we drive cavity-enhanced high-order harmonic generation …

Ultrafast thin-disk laser (TDL) oscillators provide higher intracavity pulse energy, average
power, and peak power levels than any other femtosecond laser oscillator technology. They …

The energy levels of hydrogen-like atoms and ions are accurately described by bound-state
quantum electrodynamics (QED). He+ ions have a doubly charged nucleus, which …

Intracavity high harmonic generation was utilized to generate high average-power coherent
radiation at vacuum ultraviolet (vuv) wavelengths. A ytterbium-doped fiber-laser based …

Laser-dressed photoelectron spectroscopy, employing extreme-ultraviolet attosecond
pulses obtained by femtosecond-laser-driven high-order harmonic generation, grants …

Time-resolved photoelectron spectroscopy with attosecond precision provides new insights
into the photoelectric effect and gives information about the timing of photoemission from …

We theoretically and experimentally investigate high-harmonic generation in a 78-MHz
enhancement cavity with a transverse mode having on-axis intensity maxima at the focus …

We demonstrate a high-finesse femtosecond enhancement cavity with an on-axis obstacle.
By inserting a wire with a width of 5% of the fundamental mode diameter, the finesse of F …

Enhancement cavities are passive optical resonators in which continuous-wave laser
radiation or pulses of a frequency comb are coherently overlapped, allowing for a power and …