Bismuth-doped glass microsphere lasers

Abstract

In this work, a hybrid structure consisting of a multicomponent germanate glass microsphere containing bismuth as a gain medium is proposed and presented. The bismuth-doped germanate glass microspheres were fabricated from a glass fiber tip with no precipitation of the bismuth metal. Coupling with a fiber taper, the bismuth-doped microsphere single-mode laser was observed to lase at around 1305.8 nm using 808 nm excitation. The low threshold of absorbed pump power at 215 μW makes this microlaser appealing for various applications, including tunable lasers for a range of purposes in telecommunication, biomedical, and optical information processing.

Correlation between ultrabroadband near‐infrared emission and Yb3+/Ni2+ dopants distribution in highly transparent germanate glass‐ceramics containing zinc gallogermanate nanospinels

“…The results point to the existence of at least two different Ni 2+ ligand configurations in the ZGGO NCs. Consequently, ultrabroadband NIR emission is realized in the studied GCs embedded with ZGGO NCs, and the materials hold large potential to be used as a gain medium for a broadband fiber amplifier or a microsphere laser …”

Bismuth‐doped compound germanate glass microsphere lasing in the near‐infrared region

“…Raw materials (99.999%) were weighed in a 70GeO 2 ‐15Ga 2 O 3 ‐(15‐ x ) BaO‐ x Bi 2 O 3 ( x = 1.0, 2.0, 3.0, 3.5, and 4.0 mol%) composition, mixed in ball crusher, then melted in a capped corundum crucible at 1350°C for 1 hour. In this work, the 3.5% Bi 2 O 3 doping concentration has been selected due to the previous promising outcomes of the study of photoluminescence spectra of x Bi 2 O 3 ‐doped germanate glasses under 808 nm excitation ( x = 0.0, 1.0, 2.0, 3.0, 3.5, and 4.0) . It was found that the emission of the glass samples reaches a maximum when the Bi 2 O 3 doping concentration was 3.5%.…”

Compound Glass Microsphere Resonator Devices

“…Germanate glass have a lower phonon energy, which is crucial to increasing the radiative transition rate and probability of infrared transmission of rare earth ions and thus is a better material for obtaining high luminosity in the infrared band. However, high purity germanate glasses are extremely expensive, so only a limited amount of research has been conducted on this material [35].…”

“…Bi-doped germanate glass microspheres have been effectively used to compensate for this gap in spectral coverage [35]. Compared to the conventional silica fiber (less than 0.1 mol%), the doping concentration of Bi ions in germanate glass is higher (3.5 mol%), and the melting temperature of the germanate is lower, which is more conducive to the fabrication of Bi doped germanate glass.…”

“…Microcavity lasers based on Bi-doped germanate glasses have been successfully fabricated and are described in the literature [35]. In this experiment, the diameter of the silica tapered coupling fiber and the microsphere were 3 µm and 80 µm, respectively.…”