Andreas Tünnermann

TL;DR: Based on a lithium niobate on insulator substrate, millimeter-long nanoscale waveguides were fabricated with widths as small as 200 nm, showing phase-matched second-harmonic generation.

TL;DR: In this work the first systematic experimental characterization of the reduction of the mode-field diameter in various fibers during high-power operation is carried out, and it is shown that the reduced diameter shows a characteristic behavior that scales with the core size but that is independent of the particular fiber design.

TL;DR: The optical analog of the stimulated Raman adiabatic passage via a continuum is experimentally demonstrated for photonic tunneling in femtosecond laser written waveguides and shows that the mechanism of light transfer relies on destructive interference and on the existence of a photonic dark state.

TL;DR: An expression describing pre-compensation of pulse-distortion due to saturation effects in short pulse laser-amplifiers is derived and will prove useful in applications of high power, high energy laser-AMplifier systems that need particular pulse-shapes to be efficient, e.g. micromachining and scientific laser-matter-interactions.

TL;DR: In this article, the scaling laws for the main physical quantities of high harmonic generation were discussed and the limiting effects of dephasing, absorption and plasma defocusing were analyzed, and it was shown that phase-matched and absorption-limited high-order harmonics can be achieved even for very small focal spot sizes using a target gas provided with an adequately high density.