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Cumulative plasma effects in cavity-enhanced high-order harmonic generation in gases
Modern ultrafast laser architectures enable high-order harmonic generation (HHG) in gases at (multi-) MHz repetition rates, where each atom interacts with multiple pulses before leaving the HHG volume....
PublicationsWatt-scale super-octave mid-infrared intrapulse difference frequency generation
The development of high-power, broadband sources of coherent mid-infrared radiation is currently the subject of intense research that is driven by a substantial number of existing and continuously emerging...
PublicationsTemporal solitons in free-space femtosecond enhancement cavities
Temporal dissipative solitons in nonlinear optical resonators are self-compressed, self-stabilizing and indefinitely circulating wave packets. Owing to these properties, they have been harnessed for the...
PublicationsHigh-flux ultrafast extreme-ultraviolet photoemission spectroscopy at 18.4 MHz pulse repetition rate
Laser-dressed photoelectron spectroscopy, employing extreme-ultraviolet attosecond pulses obtained by femtosecond-laser-driven high-order harmonic generation, grants access to atomic-scale electron dynamics....
PublicationsWatt-scale 50-MHz source of single-cycle waveform-stable pulses in the molecular fingerprint region
We report a coherent mid-infrared (MIR) source with a combination of broad spectral coverage (6–18 ìm), high repetition rate (50 MHz), and high average power (0.5 W). The waveform-stable pulses emerge...
PublicationsEfficiency of cavity-enhanced high harmonic generation with geometric output coupling
Cavity-enhanced high-order harmonic generation (HHG) affords broadband, coherent extremeultraviolet (XUV) pulse trains with repetition rates of several tens of MHz. Geometrically coupling out the intracavity...
PublicationsInterferometric delay tracking for low-noise Mach-Zehnder-type scanning measurements
Precise delay control is of paramount importance in optical pump-probe measurements. Here, we report on a high-precision delay tracking technique for mechanical scanning measurements in a Mach-Zehnder...
PublicationsBroadband interferometric subtraction of optical fields
We present a Mach-Zehnder-like interferometer capable of simultaneous superoctave (950 – 2100 nm) destructive interference with an intensity extinction of 4 × 10−4. Achromatic nulling is achieved...
PublicationsCavity-enhanced noncollinear high-harmonic generation
Femtosecond enhancement cavities have enabled multi-10-MHz-repetition-rate coherent extreme ultraviolet (XUV) sources with photon energies exceeding 100 eV – albeit with rather severe limitations of...
PublicationsMid-infrared long-pass filter for high-power applications based on grating diffraction
A gold-coated silicon grating has been developed, enabling efficient spatial separation of broadband mid-infrared (MIR) beams with wavelengths >5 ìm from collinearly propagating, broadband, high-power...
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