High-temperature recording of strong permanent diffraction gratings in copper-doped lithium niobate crystals based on a zero-electric-field photorefractive effect

2005 ◽  
Author(s):  
U. Hartwig ◽  
K. Peithmann ◽  
B. Sturman ◽  
K. Buse
Keyword(s):  
High Temperature ◽  
Lithium Niobate ◽  
Electric Field ◽  
Photorefractive Effect ◽  
Diffraction Gratings ◽  
Temperature Recording ◽  
Lithium Niobate Crystals

Formation of Regular Domain Structures in Quenched Ferroelectrics Under the Influence of an External High-frequency Electric Field

2019 ◽  
Vol 9 (3) ◽  
pp. 344-352 ◽  
Author(s):  
L.I. Stefanovich ◽  
O.Y. Mazur ◽  
V.V. Sobolev
Keyword(s):  
Lithium Niobate ◽  
Electric Field ◽  
Domain Structure ◽  
High Frequency ◽  
Evolution Equations ◽  
Regular Domain ◽  
Field Frequency ◽  
Domain Structures ◽  
Alternating Electric Field ◽  
Lithium Niobate Crystals

Introduction: Within the framework of the phenomenological theory of phase transitions of the second kind of Ginzburg-Landau, the kinetics of ordering of a rapidly quenched highly nonequilibrium domain structure is considered using the lithium tantalate and lithium niobate crystals as an example. Experimental: Using the statistical approach, evolution equations describing the formation of the domain structure under the influence of a high-frequency alternating electric field in the form of a standing wave were obtained. Numerical analysis has shown the possibility of forming thermodynamically stable mono- and polydomain structures. It turned out that the process of relaxation of the system to the state of thermodynamic equilibrium can proceed directly or with the formation of intermediate quasi-stationary polydomain asymmetric phases. Results: It is shown that the formation of Regular Domain Structures (RDS) is of a threshold character and occurs under the influence of an alternating electric field with an amplitude less than the critical value, whose value depends on the field frequency. The conditions for the formation of RDSs with a micrometer spatial scale were determined. Conclusion: As shown by numerical studies, the RDSs obtained retain their stability, i.e. do not disappear even after turning off the external electric field. Qualitative analysis using lithium niobate crystals as an example has shown the possibility of RDSs formation in high-frequency fields with small amplitude under resonance conditions

scholarly journals Boron Influence on Defect Structure and Properties of Lithium Niobate Crystals

Crystals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 458
Author(s):  
Nikolay V. Sidorov ◽  
Natalia A. Teplyakova ◽  
Olga V. Makarova ◽  
Mikhail N. Palatnikov ◽  
Roman A. Titov ◽  
...  
Keyword(s):  
Lithium Niobate ◽  
Defect Structure ◽  
Photorefractive Effect ◽  
Ferroelectric Properties ◽  
High Concentration ◽  
Oh Groups ◽  
Boron Doped ◽  
Compositional Uniformity ◽  
Boron Dopant ◽  
Lithium Niobate Crystals

Defect structure of nominally pure lithium niobate crystals grown from a boron doped charge have been studied by Raman and optical spectroscopy, laser conoscopy, and photoinduced light scattering. An influence of boron dopant on optical uniformity, photoelectrical fields values, and band gap have been also studied by these methods in LiNbO3 crystals. Despite a high concentration of boron in the charge (up to 2 mol%), content in the crystal does not exceed 10−4 wt%. We have calculated that boron incorporates only into tetrahedral voids of crystal structure as a part of groups [BO3]3−, which changes O–O bonds lengths in O6 octahedra. At this oxygen–metal clusters MeO6 (Me: Li, Nb) change their polarizability. The clusters determine optically nonlinear and ferroelectric properties of a crystal. Chemical interactions in the system Li2O–Nb2O5–B2O3 have been considered. Boron, being an active element, structures lithium niobate melt, which significantly influences defect structure and physical properties of a crystal grown from such a melt. At the same time, amount of defects NbLi and concentration of OH groups in LiNbO3:B is close to that in stoichiometric crystals; photorefractive effect, optical, and compositional uniformity on the contrary is higher.

Coloring Changes of Congruent LiNbO3 Crystals under Redox Annealing

2015 ◽  
Vol 230 ◽  
pp. 228-232 ◽  
Author(s):  
Dmytro Yu. Sugak
Keyword(s):  
High Temperature ◽  
Lithium Niobate ◽  
Structural Properties ◽  
High Temperature Annealing ◽  
Lithium Niobate Crystals ◽  
Congruent Lithium Niobate

The paper is to discuss the main characteristics of the influence of high temperature annealing in different gas environments on the optical and structural properties of congruent lithium niobate crystals.

Photorefractive effect at 775 nm in doped lithium niobate crystals

2013 ◽  
Vol 103 (3) ◽  
pp. 031904 ◽  
Author(s):  
G. Nava ◽  
P. Minzioni ◽  
I. Cristiani ◽  
N. Argiolas ◽  
M. Bazzan ◽  
...  
Keyword(s):  
Lithium Niobate ◽  
Photorefractive Effect ◽  
Lithium Niobate Crystals

Structure of Lithium Niobate Crystals with Low Photorefractive Effect

2014 ◽  
Vol 81 (4) ◽  
pp. 633-639 ◽  
Author(s):  
N. V. Sidorov ◽  
M. N. Palatnikov ◽  
A. A. Kruk ◽  
N. A. Teplyakova ◽  
O. V. Makarova
Keyword(s):  
Lithium Niobate ◽  
Photorefractive Effect ◽  
Lithium Niobate Crystals
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