Spectroscopy and 2.8 µm laser operation of disordered Er:CLNGG crystals
Résumé
We report on the first, to the best of our knowledge, laser operation on the 4 I 11/2 → 4 I 13/2 transition of erbium-doped disordered calcium lithium niobium gallium garnet (CLNGG) crystals with broadband mid-infrared emission properties. A 41.4 at.% Er:CLNGG continuous-wave laser generated 292 mW at 2.80 µm with 23.3% slope efficiency and a laser threshold of 209 mW. Er 3+ ions in CLNGG feature inhomogeneously broadened spectral bands ( σ SE = 1.79 × 10 −21 cm 2 at 2.79 µm; emission bandwidth, 27.5 nm), a large luminescence branching ratio for the 4 I 11/2 → 4 I 13/2 transition of 17.9%, and a favorable ratio of the 4 I 11/2 and 4 I 13/2 lifetimes, exhibiting values of 0.34 ms and 1.17 ms (for 41.4 at.% Er 3+ ), respectively.
Domaines
Physique [physics]| Origine | Fichiers produits par l'(les) auteur(s) |
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