EUROPHOTON 2022

We report the fabrication and first demonstration of crystalline grating waveguide reflectors comprising a Sc2O3 waveguide grown on a sub-wavelength-patterned sapphire substrate. Operating in the 1- and 2-micron regime, distinct TE- and TM-polarisation resonances were obtained, with reflectance approaching 50% at ~7∘ incident angle from a single waveguide and GWS.

We introduce a novel wavelength shifting concept for ultrafast lasers. We demonstrate this concept by efficiently tuning the wavelength of a 80 W, 200 fs Ytterbium-fiber laser from 1000 nm to 1060 nm. Our method supports high peak and average power operation and excellent temporal pulse quality.

The generation of two-frequency compound states is challenging, since access to two incommensurable, group-velocity matched frequencies is required. For a possible experimental realization, we propose a self-generation scheme enabled by a spectral tunneling process. With this approach, we demonstrate the generation of a compound state from a single input pulse.

We highlight the potential of liquid-core fibers as nonlinear devices for adaptive fiber applications featuring low-coupling losses, full fiber-system connectivity, and picojoule pump energy requirements. We experimentally showcase this potential by controlling the soliton fission point, the soliton self-frequency shift, and the tuneable emission of cascaded dispersive waves.

We report on the recent developments regarding unidirectional lasing observed in a reciprocal fiber ring laser. In this talk we present how retardation of Stokes assisted broadening results in a considerable reduction of required threshold power accompanied by stabilization enhancement in terms of output power and directionality in unidirectional regime.

By using the dispersion scan technique based on tunable chirped fiber Bragg gratings, the 650 ps pulses can be compressed to ~650 fs with optimized pedestals. This method allows reliable pulse-characterization and optimization without movable parts and therefore improve the stability of a laser system used in 24/7 operation.

High repetition rates in fiber-based laser systems can be achieved through multiplication in asymmetric Mach-Zehnder interferometers. We utilize a spectral band-pass filter to reduce the asymmetric dispersion that is accumulated in the different paths to increase the compressibility of the pulses.

We present an agile novel laser source delivering clean and stabilized ultrashort pulses < 500 fs at different pulse repetition rates from 10 MHz to 100 MHz and 100 mW of average power. This laser source can be easily synchronized.