Stimulated emission and excited state absorption in neodymium-doped CaNb2O6 single crystal fibers grown by the LHPG technique

Spectroscopic features of erbium-doped CaM2O6 (M=Nb, Ta) single crystal fibers grown by the laser-heated pedestal growth technique

“…From refinement of these patterns, using the Rietveld method [17], it was possible to confirm the sole formation of orthorhombic CaNb 2 O 6 -space group Pbcn, and cubic CaTa 2 O 6 -space group Pm3, crystalline phases [15,17]. The structural parameters obtained from the refinements are slightly smaller than those previously published for Nd 3+ -doped CN and CT fibers [6][7][8][9], due to smaller ionic radius of Er 3+ . In the case of polymorphic CaTa 2 O 6 , formation of stable cubic phase is due to the high cooling rate associated with the LHPG technique.…”

“…The spectrum of CN indicates a high degree of crystallization, presenting the typical narrow lines corresponding to the normal vibration modes of orthorhombic CaNb 2 O 6 [18], corroborating the XRD analysis. The maximum phonon energy for CN is at 910 cm À1 and it is transparent up to 5.5 mm [9]. As for the CT fibers, although crystallinity is also proven by the narrow XRD peaks of the cubic structure (Fig.…”

“…Recently, we have grown and characterized undoped and Nd 3+ -doped CaM 2 O 6 (M ¼ Nb, Ta) single crystal fibers, with excellent optical quality [6][7][8][9], by the versatile and economically advantageous laser-heated pedestal growth (LHPG) technique [10][11][12][13]. Despite its interesting optical and spectroscopic characteristics, CaTa 2 O 6 (CT) has mostly been studied as a dielectric ceramic, for microwave resonators [14], and no work has been reported in crystals.…”

Recent advances in lanthanide spectroscopy in Brazil

“…Other investigations reporting the use and/or development of theoretical models or methodologies have been discussed in the literature [8,12,13,15,17,28,43,55,56,86,[199][200][201][202][203][204][205][206][207].…”

Molten salt synthesis and optical properties of Eu3+, Dy3+or Nd3+ doped NiNb2O6 columbite-type phosphors

“…There are a few studies on the luminescent properties of rare earth doped columbite transition metal niobate compounds in the literature [2][3][4][5][6][7][8][9][10][11].…”