scholarly journals Collinear acousto-optical filtration of polychromatic Bessel light beams in lithium niobate crystals

2021 ◽  
Vol 2127 (1) ◽  
pp. 012033
Author(s):  
G V Kulak ◽  
P I Ropot ◽  
O V Shakin
Keyword(s):  
Lithium Niobate ◽  
Lithium Niobate Crystal ◽  
Overlap Integrals ◽  
Phase Synchronism ◽  
Bessel Light Beam ◽  
Filter Bandwidth ◽  
Acousto Optical Interaction ◽  
Light Beams ◽  
Lithium Niobate Crystals ◽  
Bessel Light Beams

Abstract The features of collinear acousto - optical filtration of quasi - diffractive Bessel light beams of o- and e-type in uniaxial crystals are investigated. Using the method of overlap integrals, an expression is found for the diffraction efficiency depending on the parameters of the acousto-optical interaction, as well as on the values of the overlap integrals. It is shown that for the zero-order mode of a Bessel light beam for a lithium niobate crystal under conditions of transverse phase synchronism and in the optical spectrum range of 0.4-0.7 μm, the filter bandwidth of ∼0.2 nm is achievable; with an increase in the order of the mode m≥1, the increase in the bandwidth is insignificant and is ∼0.23 -0.24 nm.

Kinetic Dependencies of the Photorefractive Effect in Lithium Niobate Crystals

2018 ◽  
Vol 386 ◽  
pp. 186-190
Author(s):  
Alexander Vjacheslavovich Syuy ◽  
Alexei A. Gabain ◽  
Natalia A. Teplyakova ◽  
Nikolay V. Sidorov ◽  
Mikhail N. Palatnikov
Keyword(s):  
Light Scattering ◽  
Lithium Niobate ◽  
Lithium Niobate Crystal ◽  
Photorefractive Effect ◽  
Kinetic Dependence ◽  
Photoinduced Light Scattering ◽  
Lithium Niobate Crystals ◽  
Congruent Lithium Niobate

The kinetic dependence of the photorefractive effect in the congruent lithium niobate crystal is determined in the work. The adequacy of the model for calculating the photoelectric fields from the indicatrix of photoinduced light scattering is shown. Two methods for determining the induced birefringence by interferograms and on the parameters of photoinduced light scattering are compared.

Pyroelectric Self-Focusing of Light Beams in Reduced Lithium Niobate Crystals

2015 ◽  
Vol 82 (3) ◽  
pp. 479-482 ◽  
Author(s):  
S. M. Kostritskii ◽  
M. Chauvet ◽  
J. Safi oui ◽  
M. Aillerie ◽  
O. G. Sevostyanov
Keyword(s):  
Lithium Niobate ◽  
Self Focusing ◽  
Light Beams ◽  
Lithium Niobate Crystals

scholarly journals Calculation of nonlinear optical properties of lithium niobate crystals

2021 ◽  
Vol 12 (2-2021) ◽  
pp. 72-76
Author(s):  
D. A. Vorobev ◽  
◽  
O. V. Sidorova ◽  
M. N. Palatnikov ◽  
A. V. Kadetova ◽  
...  
Keyword(s):  
Optical Properties ◽  
Lithium Niobate ◽  
Nonlinear Optical ◽  
Frequency Conversion ◽  
Lithium Niobate Crystal ◽  
Second Harmonic ◽  
Polar Axis ◽  
Nonlinear Optical Properties ◽  
Optical Effects ◽  
Lithium Niobate Crystals

The coefficients of the second-order nonlinear optical tensor for lithium niobate crystal with a composition close to stoichiometric were calculated. The calculated results show that the contribution of the Li-O group to the optical effects of the second harmonic was greater than the contribution of the Nb-O group. The results also showed that the most efficient frequency conversion occurred along the polar axis of the crystal

Transformation of Evanescent Bessel Light Beams into Propagating Quasi-Nondiffracting Beams in Epsilon-Near-Zero Hyperbolic Metamaterials

2019 ◽  
Vol 18 (03n04) ◽  
pp. 1940020
Author(s):  
S. Kurilkina ◽  
V. Belyi ◽  
N. Kazak
Keyword(s):  
Light Beam ◽  
Wave Vector ◽  
Bessel Light Beam ◽  
Hyperbolic Metamaterials ◽  
Zero Curvature ◽  
Light Beams ◽  
Bessel Light Beams ◽  
Epsilon Near Zero

In this paper, we show the possibility of rebuilding of the structure of wave vector surface and the appearance of its local parts with near zero curvature for epsilon-near-zero hyperbolic metamaterials. It is established that when evanescent Bessel light beam falls in special directions related to these local parts, it is transformed into propagating one. The features of transformed beam are analyzed.

Growth and Characterization of High Homogeneity Heavily MgO-doped Lithium Niobate Crystals

2011 ◽  
Vol 25 (12) ◽  
pp. 1257-1262 ◽  
Author(s):  
Xiao-Niu TU ◽  
Yan-Qing ZHENG ◽  
Hui CHEN ◽  
Hai-Kuan KONG ◽  
Jun XIN ◽  
...  
Keyword(s):  
Lithium Niobate ◽  
High Homogeneity ◽  
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.

Microindentation of proton exchange layers on X cut of lithium niobate crystals

2012 ◽  
Vol 135 (2-3) ◽  
pp. 493-496 ◽  
Author(s):  
I.V. Petukhov ◽  
V.I. Kichigin ◽  
A.P. Skachkov ◽  
S.S. Mushinsky ◽  
D.I. Shevtsov ◽  
...  
Keyword(s):  
Lithium Niobate ◽  
Proton Exchange ◽  
Lithium Niobate Crystals
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