Defect structure and spectroscopic characteristics of codoped Hf: Er: LiNbO<sub>3</sub> crystals

Sun, L.; Yang, Chunhui; Xu, Yuheng; Zhao, Liancheng

doi:10.1002/crat.200800332

Cited by 5 publications

(2 citation statements)

References 14 publications

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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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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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“…Recently, being a favorable material for holographic storage application, co‐doped Fe:Cu:LiNbO 3 crystal has attracted extensive interest . However, it also has shortcomings, such as optical damage, longer response time, and lower sensitivity . In order to eliminate the defect of the co‐doped crystals, people dope rare‐earth ions into the crystals .…”

Section: Introductionmentioning

confidence: 99%

Hf⁴⁺ Ion Concentration Dependence of Holographic Storage Properties in Hf:Fe:Cu:LiNbO₃ Crystals

Dai

Han

Shao

et al. 2018

Crystal Research and Technology

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A series of Hf:Fe:Cu:LiNbO3 crystal with various concentrations of Hf 4+ ion doping are grown in air by the conventional Czochralski technique. The segregation coefficients of the Hf 4+, Fe3+, and Cu2+ ions in the crystals are carried out with an inductively coupled plasma‐atomic emission spectrometer. The birefringence gradient method is measured in order to analyze the optical homogeneity of Hf:Fe:Cu:LiNbO3 crystals. The holographic storage properties of Hf:Fe:Cu:LiNbO3 crystals are investigated by the two‐wavelength coupling experiment. The result shows that the writing time constant shortens from 529.3 to 214.4 s, and the dynamic range increases from 1.12 to 8.07 with increasing Hf 4+ content in the Hf:Fe:Cu:LiNbO3 crystals.

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Influence of Zn²⁺ ions concentration on the optical properties of Zn/Er:LiNbO₃ crystals

Qian

Wang

Xing

et al. 2011

Cryst. Res. Technol.

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(3 mol%):LiNbO 3 crystals codoped with ZnO (X mol%, X=0, 3, 6 and 7) were grown by the Czochralski technique. The Er contents in the crystals were measured by an inductively coupled plasma atomic emission spectrometer (ICP-AES). Under 800 nm excitation, the upconversion emission spectra reveal an enhancement of the green emission with respect to the red emission when the Zn 2+ ions are introduced into Er:LiNbO 3 crystal. The effect of Zn 2+ ions concentration on the intensity ratio of the green to red emission has been investigated. Two cross-relaxation processes ( 2 H 11/2 + 4 I 13/2 → 4 I 11/2 + 4 F 9/2 and 4 F 7/2 + 4 I 11/2 → 4 F 9/2 + 4 F 9/2 ) are involved in populating the 4 F 9/2 state, which bypass the green-emitting states. The OH -absorption spectra indicate that the Zn 2+ codoping leads to a decreased concentration of Er 3+ cluster sites contributing to the enhancement of the green emission. The studies on UV-vis absorption spectra show that the heavily codoped with Zn 2+ results in the reformation of the Er 3+ cluster sites in Er:LiNbO 3 .

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Defect structure and spectroscopic characteristics of codoped Hf: Er: LiNbO₃ crystals

Cited by 5 publications

References 14 publications

Modification of band gap in lithium niobate caused by indium incorporation

Modification of band gap in lithium niobate caused by indium incorporation

Hf⁴⁺ Ion Concentration Dependence of Holographic Storage Properties in Hf:Fe:Cu:LiNbO₃ Crystals

Influence of Zn²⁺ ions concentration on the optical properties of Zn/Er:LiNbO₃ crystals

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Defect structure and spectroscopic characteristics of codoped Hf: Er: LiNbO3 crystals

Cited by 5 publications

References 14 publications

Modification of band gap in lithium niobate caused by indium incorporation

Modification of band gap in lithium niobate caused by indium incorporation

Hf 4+ Ion Concentration Dependence of Holographic Storage Properties in Hf:Fe:Cu:LiNbO3 Crystals

Influence of Zn2+ ions concentration on the optical properties of Zn/Er:LiNbO3 crystals

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Defect structure and spectroscopic characteristics of codoped Hf: Er: LiNbO₃ crystals

Hf⁴⁺ Ion Concentration Dependence of Holographic Storage Properties in Hf:Fe:Cu:LiNbO₃ Crystals

Influence of Zn²⁺ ions concentration on the optical properties of Zn/Er:LiNbO₃ crystals