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 × 10−21 cm2 around 2055 nm and lifetime of Ho3+: 5I7 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.

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