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Polarization and local disorder effects on the properties of Er3+-doped XBi(YO4)2, X=Li or Na and Y=W or Mo, crystalline tunable laser hosts

AuthorsRico, Mauricio ; Méndez-Blas, Antonio; Volkov, Vladimir; Monge, M. Ángeles ; Cascales, Concepción ; Zaldo, Carlos ; Kling, Andreas; Fernández-Díaz, M. T.
Keywordsrare-earth ions
absorption intensities
Crystal Growth
Laser Materials
Issue DateOct-2006
PublisherOptical Society of America
CitationJournal of the Optical Society of America B - Optical Physics 23(10): 2066-2078 (2006)
AbstractPure and Er-doped ([Er]crystal≤2.4 × 1020 cm−3), NaBi(WO4)2 (NBW), NaBi(MoO4)2, and LiBi(MoO4)2 crystals have been grown by the Czochralski method. The three crystal hosts have similar structural and optical properties. The noncentrosymmetric space group I4¯ (No. 82) crystallographic structure has been established through 300 K single-crystal x-ray and neutron (for NBW only) diffraction. Er3+ energy levels were determined experimentally and simulated in the S4 symmetry through a crystal-field analysis. With this background, the large spectroscopic bandwidths observed were ascribed to the presence of two 2b and 2d sites for Er3+ and to different short-range Na+ and Bi3+ distributions around both sites. The radiative properties of Er3+ are described by the Judd-Ofelt theory achieving branching ratios and radiative lifetimes for transitions useful as laser channels. The 4I13/2—>4I15/2 laser channel (λ≈1.5 μm) shows a peak emission cross-section σEMI(λ≈1530 nm)≈0.5×10−20 cm2 and a quantum efficiency η∞0.68 to 0.74. The laser emission is envisaged to be tunable by Δλ≈100 nm.
Publisher version (URL)http://dx.doi.org/10.1364/JOSAB.23.002066
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