An all-fiber Pr/Yb-doped up-conversion laser in different laser operation modes

Fiber laser systems have the potential to represent an interesting alternative to more conventional laser sources emitting in the visible spectral range. In this contribution we present new results based on fluoride Pr/Yb- doped fiber systems. This Pr/Yb-doped fiber system with emission wavelengths in the red, orange, green and blue spectral range can be operated as a tunable laser source with a tuning range (around 605 nm) of almost 8 nm and as a mode-locked laser system with a pulse duration below 100 ps. The laser system was realized using Pr/Yb-doped fluoride fibers as an active medium and fiber Bragg gratings in silica fibers as the basic element for the realization of the reflective and tuning components.