Filamentation of 10 mJ, 23 fs Ti:Sapphire pulses inside a cell filled with argon. Visible is the generated intense white light along propagation.

Extreme Photonics

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Advances in nonlinear optics are tightly interlinked with performance of high peak power coherent light sources. We utilize techniques such as OPA and OPCPA for waveform engineering of controlled intense light fields across the UV to the mid-IR spectral range. These sources have reached top performance with e.g. 2000 nm, 1.6-cycle duration, self-CEP stable and with 1 mJ pulse energy at 4 kHz. Current interest lies in the long wavelength range with sources tunable or operating at 2000 nm, 3100 nm, 6000 nm and beyond.

EExtreme photonics is concerned with the interaction of intense light fields with matter. For instance, we investigate, and use physical phenomena such as filamentation to study X-wave generation. We have made pioneering contributions, e.g. achieving one of the shortest pulse durations (1.3 cycles at 3400 nm) and introduced filamentation for the generation of intense sub-2-cycle light fields. Recent breakthroughs include the first demonstration of isolated attosecond soft X-ray pulses at 300 to 500 eV.