Heavily Ho^3+-doped lead silicate glass fiber for ~2 μm fiber lasers

A heavily Ho3+-doped lead silicate glass with low content of hydroxyls was prepared in this paper. Luminescent properties of this glass were characterized. Peak emission cross section reached 3.07 x 10(-21) cm(2) around 2055 nm and lifetime of Ho3+:I-5(7) was fitted to be 1.31 ms. A single-cald fiber was prepared using this glass as the core. An all-fiber configuration was constructed. Under in-band core-pump of a silica fiber laser, a single-mode maximum 60 mW was realized in a 6 cm-long fiber, which shows high potential for single-frequency fiber lasers applications. (C) 2016 Optical Society of America