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High-power sub-two-cycle mid-infrared pulses at 100 MHz repetition rate
Powerful coherent light with a spectrum spanning the mid-infrared (MIR) spectral range is crucial for a number of applications in natural as well as life sciences, but so far has only been available from...
PublicationsAcousto-optic pulse picking scheme with carrierfrequency-to-pulse-repetition-rate synchronization
We introduce and experimentally validate a pulse picking technique based on a travelling-wave-type acousto-optic modulator (AOM) having the AOM carrier frequency synchronized to the repetition rate of...
PublicationsFemtosecond Enhancement Cavities in the Nonlinear Regime
We combine high-finesse optical resonators and spatial-spectral interferometry to a highly phasesensitive investigation technique for nonlinear light-matter interactions. We experimentally validate an...
PublicationsEnhancement cavities for zero-offset-frequency pulse trains
The optimal enhancement of broadband optical pulses in a passive resonator requires a seeding pulse train with a specific carrier-envelope-offset frequency. Here, we control the phase of the cavity mirrors...
PublicationsBalancing of thermal lenses in enhancement cavities with transmissive elements
Thermal lensing poses a serious challenge for the power scaling of enhancement cavities, in particular when these contain transmissive elements. We demonstrate the compensation of the lensing induced by...
PublicationsGeometrical on-axis access to high-finesse resonators by quasi-imaging: a theoretical description
We describe a novel method for providing geometrical on-axis access to an optical enhancement resonator through an on-axis aperture at one of its mirrors. A superposition of transverse modes in a stable...
PublicationsA concept for multiterawatt fibre lasers based on coherent pulse stacking in passive cavities
Since the advent of femtosecond lasers, performance improvements have constantly impacted on existing applications and enabled novel applications. However, one performance feature bearing the potential...
PublicationsMegawatt-scale average-power ultrashort pulses in an enhancement cavity
We investigate power scaling of ultrashort-pulse enhancement cavities. We propose a model for the sensitivity of a cavity design to thermal deformations of the mirrors due to the high circulating powers....
PublicationsStack and dump: Peak-power scaling by coherent pulse addition in passive cavities
During the last decades femtosecond lasers have proven their vast benefit in both scientific and technological tasks. Nevertheless, one laser feature bearing the tremendous potential for high-field applications,...
PublicationsHigh-harmonic generation at 250 MHz with photon energies exceeding 100 eV
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 (HHG) at a repetition...
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