Jens Thomas

TL;DR: In this article, the authors apply simultaneous spatial and temporal focusing (SSTF) to femtosecond (fs)-lasers for high precision micromachining of transparent materials because nonlinear absorption in the focus can result in refractive index modifications or material disruptions.

TL;DR: By pumping the fiber containing the fabricated FBG, it was possible to realize a fiber laser with an output power of 38 mW, a slope efficiency of 21.1%, and low noise (SNR=60 dB).

TL;DR: It is demonstrated that the effective modal index for type II gratings written with a femtosecond laser using the point-by-point (PbP) method must be lower than that of the pristine fiber, and for the first time associate an axis with a polarization such that the long axis of the elliptically-shaped index modulations corresponds to the slowaxis of the gratings.

TL;DR: In this paper, thermally stable optical waveguides written in periodically poled lithium niobate with a femtosecond laser using a two line approach were reported, and both fundamental and second harmonic light at 1064 and 532nm were guided with low damping losses.

TL;DR: This paper shows how the reflected cladding modes can be fully analyzed, taking their vectorial nature, orientation and degeneracies into account, and the observed modes' polarization and intensity distributions are directly tied to the dispersive properties.