A5076002848- Laser-Matter Interactions and Applications
- Solid State Laser Technologies
- Terahertz technology and applications
- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
- Photonic Crystal and Fiber Optics
- Laser Design and Applications
- Spectroscopy and Laser Applications
- Spectroscopy and Quantum Chemical Studies
- Plasmonic and Surface Plasmon Research
- Gold and Silver Nanoparticles Synthesis and Applications
- Photorefractive and Nonlinear Optics
- Laser-Plasma Interactions and Diagnostics
Ludwig-Maximilians-Universität München
2015-2019
LMU Klinikum
2017-2019
We report the generation of extremely broadband and inherently phase-locked mid-infrared pulses covering 5 to 11 µm region.The concept is based on two stages optical parametric amplification starting from a 270-fs Yb:KGW laser source.A continuum seeded, second harmonic pumped pre-amplifier in β-BaB 2 O 4 (BBO) produces tailored near-infrared that are subsequently mixed with fundamental pump LiGaS (LGS) for amplification.The pulse bandwidth chirp managed entirely by selected filters bulk...
We demonstrate a compact source of energetic and phase-locked multi-terahertz pulses at repetition rate 190 kHz. Difference frequency mixing the fundamental output an Yb:KGW amplifier with idler optical parametric in GaSe LiGaS2 crystals yields passively train waveforms tunable between 12 42 THz. The shortest contain 1.8 oscillation cycles within intensity full width half-maximum. Pulse energies up to 0.16 μJ peak electric fields 13 MV/cm are achieved. Electro-optic sampling reveals phase...
We describe a setup for time-resolved photoemission electron microscopy with aberration correction enabling 3 nm spatial resolution and sub-20 fs temporal resolution. The latter is realized by our development of widely tunable (215–970 nm) noncollinear optical parametric amplifier (NOPA) at 1 MHz repetition rate. discuss several exemplary applications. Efficient from plasmonic Au nanoresonators investigated phase-coherent pulse pairs an actively stabilized interferometer. More complex...
We discriminate different field dynamics across distances as small 33 nm within a plasmonic slit resonator using aberration-corrected photoemission electron microscopy and tunable broadband optical parametric amplifier at 1 MHz repetition rate.
Generation of sub-10 fs continuum pulses without external compression is demonstrated. We investigate the propagation newly generated wavelengths and find that a short crystal in combination with an achromatic telescope leads to nearly chirp free continua.
Summary form only given. For many applications the second and third harmonic of a laser system is required quite often high pulse energies are desired - therefore efficiency SHG THG processes should be high. In literature efficiencies can found frequently. Values up to 60 % higher for reported femtosecond regime BBO as nonlinear medium. We now find that pushing such leads distorted beam profiles broadened, structured spectra harmonics due Kerr effect in Our calculations show common...
Summary form only given. Femtosecond pulses are primarily generated at 800 or 1030 nm in Ti:sapphire Yb based systems. To generate fully tunable over the full visible and NIR range, optical parametric amplifiers particular white light seeded noncollinear (NOPA) now widely used. For highest energy this scheme is expanded to OPCPAs. Energy beam pointing stability a crucial topic application of all these sources. We investigated - best our knowledge for first time how instability pump laser...