Growth of Zr codoped Er:LiNbO3 and Er/Yb:LiNbO3 single crystal

Qian, Yannan; Wang, Rui; Wang, Biao; Xu, Chao; Xu, Wenbin; Wu, Xiyong; Xu, Yuheng; Xing, Lili; Yang, Chunhui

doi:10.1016/j.jcrysgro.2012.09.014

Cited by 5 publications

(1 citation statement)

References 31 publications

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“…Since the polarization ability is in the order of Sm 3+ > Nb 5+ > Li + , the transition energy from the 2 p orbital of O 2− to the 4 d orbital of Nb 5+ decreases, and results in a shift of the absorption edge to the longer wavelengths when

{Nb}_{Li}^{4 +}

defects were replaced by Sm 3+ ion. After

{Nb}_{Li}^{4 +}

are completely replaced by Sm 3+ , the doped ions may replace Li-site and Nb-site to form

{Sm}_{Li}^{2 +}

{- Sm}_{Nb}^{2 -}

center [22,23,24], and give rise to the absorption edge that goes toward the shorter wavelengths; hence, the inversion of the absorption edge illustrates that the threshold concentration of Sm 3+ in the LiNbO 3 single crystal is between 0.6 mol.% and 1.0 mol.%. This is due to the interionic distances between O 2− and Nb 5+ becoming expanded with the doped Sm 3+ concentration, which is caused by the lattice of Sm:LN crystals slightly increasing, as shown in Table 1.…”

Section: Resultsmentioning

confidence: 99%

Temperature-Dependent and Threshold Behavior of Sm3+ Ions on Fluorescence Properties of Lithium Niobate Single Crystals

et al. 2018

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Temperature-dependent and threshold behavior of Sm3+ ions on fluorescence properties of lithium niobate (LiNbO3, LN) single crystals were systematically investigated. The test materials, congruent LiNbO3 single crystals (Sm:LN), with various concentrations of doped Sm3+ ions from 0.2 to 2.0 mol.%, were grown using the Czochralski technique. Absorption spectra were obtained at room temperature, and photoluminescence spectra were measured at various temperatures in the range from 73 K to 423 K. Judd–Ofelt theory was applied to calculate the intensity parameters Ωt (t = 2, 4, 6) for 1.0 mol.% Sm3+-doped LiNbO3, as well as the radiative transition rate, Ar, branching ratio, β, and radiative lifetime, τr, of the fluorescent 4G5/2 level. Under 409 nm laser excitation, the photoluminescence spectra of the visible fluorescence of Sm3+ mainly contains 568, 610, and 651 nm emission spectra, corresponding to the energy level transitions of 4G5/2→6H5/2, 4G5/2→6H7/2, and 4G5/2→6H9/2, respectively. The concentration of Sm3+ ions has great impact on the fluorescence intensity. The luminescence intensity of Sm (1.0 mol.%):LN is about ten times as against Sm (0.2 mol.%):LN at 610 nm. The intensity of the fluorescence spectra were found to be highly depend on temperature, as well as the concentration of Sm3+ ions in LiNbO3 single crystals, as predicted; however, the lifetime changed little with the temperature, indicating that the temperature has little effect on it, in Sm:LN single crystals. Sm:LN single crystals, with orange-red emission spectra, can be used as the active material in new light sources, fluorescent display devices, UV-sensors, and visible lasers.

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