Ultrabroadband tunable femtosecond lasersystem

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The proposed femtosecond laser system will be used as a laser source for three different types of experiments, thus significantly expanding the experimental possibilities of the research group: 1. to develop materials for three-dimensional laser lithography (polymer-based photosensitive materials, materials for direct metal printing, absorbing and non-linear materials for infiltration) as a brilliant light source on an existing FTIR microscope spectrometer. For this purpose the fingerprint range up to 8 µm wavelength with high brilliance and low noise has to be characterized. This allows the identification of the chemical reactions involved.2. for time-resolved pump-probe spectroscopy on ferro- and antiferromagnetic materials to study the photon-magnon conversion processes in these materials. NIR pump and THz probe experiments as well as THz pump and optical probe experiments will be performed. Of particular interest are experiments that allow the emission of THz radiation after an intense NIR pulse compared to the resonant excitation of optical phonons. For this purpose, the laser system must be able to address wavelengths up to 20 µm (15 THz) and must also provide an output with intense pulses with a pulse duration < 50 fs, which allows the generation of broadband terahertz pulses of 1-40 THz via spintronic terahertz emitters.3. for spatially resolved spectroscopy of three-dimensional photonic structures to identify the mode distribution in disordered samples and to characterize samples with topological properties with angular resolution. Among other things, Weyl points in three-dimensional photonic crystals, which are at 2-4 µm, are currently to be spectroscopied.