Andreas Tünnermann

TL;DR: In this article, a high power monolithic CW fiber oscillator with an output power of 215 W in a 20μm diameter few-mode Large Mode Area fiber (LMA) was developed.

TL;DR: By dynamically varying the power content of the excited fiber modes of the main amplifier of a fiber-based MOPA system at high average output power levels, it was possible to mitigate mode instabilities to a large extent as discussed by the authors.

TL;DR: In this paper, an in situ emission filter generation for fluorescence light detection by morphology tailoring of silver nanoparticles within a polymer layer, is presented for the first time, after depositing a pretreated film of polyethylenimine containing spherical nanoparticles, was irradiated with green LEDs (peak wavelength 530 nm).

TL;DR: In this article, the welding of fused silica with bursts of ultrashort laser pulses is described, where the time between the laser bursts is about 10 μs, which reduces the maximal temperature rise and the usage of bursts instead of continuous pulse trains reduces the laser induced stress.

TL;DR: A method to simulate induced stresses for a laser crystal packaging technique and the consequent study of birefringent effects inside the laser cavities has been developed and showed almost no difference between the input and output laser beams.