Room-Temperature A<sub>1</sub>(TO) and OH<sup>-</sup>Absorption Spectra of Zn-Doped Lithium Niobate Crystals

Chia, Chih Ta; Sun, M. L.; Hu, Ming; Chang, Jung Yang; Tse, W. S.; Yang, Zu‐Po; Cheng, Hao-Tien

doi:10.1143/jjap.42.6234

Cited by 6 publications

(2 citation statements)

References 27 publications

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“…This implies that the absorption spectra are mainly predominated by the defect structure, and this result is consistent with several previous observations. 16,17) In Fig. 2, the subtracted OH À absorption spectra (obtained from the ratio of the spectra of the after-PE-treatment and before-PE-treatment samples) are shown, and the proton substitution effect can be clearly observed.…”

Section: Resultsmentioning

confidence: 99%

OH^- Absorption of Zn-Doped LiNbO₃ Single Crystals after Proton Exchange

Tsai

Chang

et al. 2007

jjap

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An investigation of the OH À absorption spectra of Zn-doped LiNbO 3 single crystals with doping concentrations from 0.0 to 8.3 mol % after proton exchange (PE) is carried out. Before PE treatment, the absorption bands are found centered at approximately 3485 cm À1 for the samples with Zn-doping concentrations below 7.5 mol %, whereas two distinct bands at 3505 and 3530 cm À1 are clearly observed for the samples with Zn-doping concentrations above 7.5 mol %. After PE treatment, an absorption band at 3505 cm À1 is predominant for all the samples, and this is attributed to the high concentration of H þ ions substituting Li atoms. However, for the highly Zn-doped samples, the lineshape and intensity of the 3530 cm À1 mode remain the same during PE. A theoretical investigation using the hybrid density functional B3LYP method with a simple cluster structure shows that the origins of the 3485 and 3530 cm À1 absorption modes correspond to the Li-and Nb-vacancy models, respectively.

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Section: Resultsmentioning

confidence: 99%

OH^- Absorption of Zn-Doped LiNbO₃ Single Crystals after Proton Exchange

Tsai

Chang

et al. 2007

jjap

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“…It has generally been accepted that the 3484 cm −1 (2.87 μm) absorption band is intimately associated with the 0–1 stretching vibrational band of OH − molecular defects in LiNbO 3 . Furthermore, when the concentration of optical damage resistance impurities is above from a certain value then the IR absorption band shifts to larger energies (to shorter wavelengths) . In order to identify which samples analyzed in this work present an IR band shift, optical density data around the OH − optical absorption were measured.…”

Section: Resultsmentioning

confidence: 99%

Modification of band gap in lithium niobate caused by indium incorporation

Castillo-Torres

2013

Physica Status Solidi (b)

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Phone: þ52 01 953 5320214, ext: 290, Fax: þ52 01 953 5320399Measurements on transition energies near the optical absorption band edge for lithium niobate samples doped with indium at several concentrations are presented. Indirect and direct optical absorption processes were analyzed. It was found that the energies for these transitions are larger than those corresponding to undoped lithium niobate, suggesting that the energy band structure was modified by the presence of indium. For an indium concentration between 0 and 4 mol%, a value of energy of 3.8 eV was measured for indirect transition, and a range of 3.9-4.0 eV was determined for direct transition energy; whereas 3.6 and 3.8 eV were obtained, respectively, for the corresponding values of pure lithium niobate. In addition, Urbach and phonon energies were also calculated for the same indium-doped lithium niobate samples which values are lesser than those obtained for pure lithium niobate. Both behaviors remain unaltered regardless of whether the indium concentration is above or below the optical damage threshold value. Substitution of only lithium vacancies and antisite defects by indium atoms for any concentration of doping may explain the results.

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Substitution mechanism of ZnO-doped lithium niobate crystal determined by powder x-ray diffraction and coercive field

Chia¹,

Lee²,

Chang³

et al. 2005

Applied Physics Letters

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ZnO-doped lithium niobate crystals with a doped concentration of up to 8.3mol% were grown by the Czochralski technique. The effects of incorporating Zn2+ ions into LiNbO3 crystals were studied by powder x-ray diffraction and taking polarization hysteresis loop measurements. When the Li-site vacancy model is adopted, the coercive fields obtained from the polarization reversal measurement depend strongly on the number of NbLi4−+4VLi−. However, the coercive field of Zn-doped ions into LiNbO3 is insensitive to the ZnLi2++VLi−. Experimental results indicate that four distinct substitutions of Zn−2 ions incorporated into ions into LiNbO3 crystals for doping concentrations from 0to8.3mol%. The extent of Zn substitution is quantitatively determined for doping of below 7.5mol%.

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Room-Temperature A₁(TO) and OH^-Absorption Spectra of Zn-Doped Lithium Niobate Crystals

Cited by 6 publications

References 27 publications

OH^- Absorption of Zn-Doped LiNbO₃ Single Crystals after Proton Exchange

OH^- Absorption of Zn-Doped LiNbO₃ Single Crystals after Proton Exchange

Modification of band gap in lithium niobate caused by indium incorporation

Substitution mechanism of ZnO-doped lithium niobate crystal determined by powder x-ray diffraction and coercive field

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Room-Temperature A1(TO) and OH-Absorption Spectra of Zn-Doped Lithium Niobate Crystals

Cited by 6 publications

References 27 publications

OH- Absorption of Zn-Doped LiNbO3 Single Crystals after Proton Exchange

OH- Absorption of Zn-Doped LiNbO3 Single Crystals after Proton Exchange

Modification of band gap in lithium niobate caused by indium incorporation

Substitution mechanism of ZnO-doped lithium niobate crystal determined by powder x-ray diffraction and coercive field

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Room-Temperature A₁(TO) and OH^-Absorption Spectra of Zn-Doped Lithium Niobate Crystals

OH^- Absorption of Zn-Doped LiNbO₃ Single Crystals after Proton Exchange

OH^- Absorption of Zn-Doped LiNbO₃ Single Crystals after Proton Exchange