Power scaling of a 2.1 μm Ho3+-doped fiber laser integrating a 1.9 µm triple clad fiber pump combiner

In this conference, we show the realization of a high power 2.12 μm Ho3+-doped fiber (HDF) laser integrating for the first time to our knowledge a 1.94 μm triple clad fiber (3CF) combiner. This 3CF combiner, specifically developed for the above mentioned HDF laser, presents low losses properties thanks to a low-index glass capillary implemented in the component. Moreover, in this contribution we will discuss the power scalability of such a HDF laser monolithic architecture based on a triple clad fiber combiner pumped at 1.94 μm using Tm3+-doped fiber lasers.