Dysprosium in fluoroindate glass: a platform for mid-infrared laser development [Invited]
Year: 2026
Type: article
Abstract: We report a comprehensive spectroscopic investigation of Dysprosium (Dy 3+ )-doped fluoroindate (InF 3 -based) glasses as a promising material platform for mid-infrared fiber lasers. Dy 3+ ions exhibit a stimulated emission cross-section of 0.31 × 10 −20 cm 2 at 2924 nm for the 6 H 13/2 → 6 H 15/2 transition, with a gain bandwidth of >500 nm. The associated Stokes multiphonon emission sideband further extends the emission up to at least 4 µm. Transition probabilities of Dy 3+ ions are analyzed using a modified Judd–Ofelt formalism incorporating configuration interaction effects. Concentration quenching of the 6 H 13/2 excited-state lifetime is characterized, and anomalously strong multiphonon nonradiative relaxation is discussed. These properties are evaluated in comparison with other low-phonon-energy host matrices for Dy 3+ doping. Energy transfer processes in Er 3+ ,Dy 3+ codoped glasses are quantified. Laser action is demonstrated in a bulk Er 3+ ,Dy 3+ :InF 3 -based glass, with free-running emission spanning 2.7–3.4 µm, and, in addition, a double-clad fiber laser diode-pumped at 976 nm delivers output power at the 100 mW level at 3.3 µm. InF 3 -based glass fibers with optimized codoping concentrations emerge as promising candidates for broadly wavelength-tunable and ultrashort-pulse mid-infrared laser sources.
Source: Optical Materials Express
DOI: 10.1364/ome.596515
Language: English
Subfield: Ceramics and Composites
Field: Materials Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,843
OpenAlex ID: W7161640729