EUROPHOTON 2022

Recent developments in two-micron thulium and thulium-holmium doped solid-state and fiber lasers allow for significant average-power and pulse-energy scaling, important for mid-IR OPO pumping, materials processing and communication. A focus is put on all-fiber designs and robust, if possible self-aligning, laser resonators, which allow for stable and ruggedized designs.

Highest peak powers pave new insights for fundamental research. The performance of laser beam lines is mainly determined by the quality of the optical components. This paper presents novel approaches to manufacture laser mirrors with optimized laser induced damage threshold applying ion beam sputtering up to substrate sizes of 550mm.