Abstract

Recent studies suggest fluoroindate (InF₃ glass fibers to be better suited for the development of mid-infrared fiber lasers systems as compared to the commonly used fluorozirconate (ZBLAN) fibers [1]. The extended transparency window up to 5.5 µm and the increased resistance to water ingress [2] allowed the demonstration of laser emission in 3 – 4 µm region using a variety of dopants as well as record output powers in the 4 µm region [3]. However, the reported efficiencies to date are all well below the Stokes limit, suggesting background loss (BL) to be a limiting factor for power scaling of fluoroindate fiber lasers [4].

© 2023 IEEE