True LMA fiber featuring a unique low NA (< 0.1) high concentration Ho-doped core design. The Ho-doped fiber can be pumped by a Tm-doped fiber laser at ~1950 nm and can achieve 60% efficiency. The Ho-doped fiber features a unique all-glass cladding design with a 40 µm diameter Ho-doped core, a glass inner cladding diameter of 250 µm, a 320 µm 0.22NA index depressed outer glass cladding for the pump radiation and a fluoroacrylate outer polymer jacket (40/250/320/400).
General