Recent achievements on middle and far-infrared second-order nonlinear optical materials

This paper examines the domain patterns and the macroscopic behaviour of single crystals of ferroelectric material using a theory based on energy minimization. A low-energy path is identified for domain switching and a novel configuration that yields very large electrostriction is identified.

/pdf/domain-patterns-and-macroscopic-behaviour-of-ferroelectric-nn01cl2nmz.pdf

Domain patterns and macroscopic behaviour of ferroelectric materials

Electro-optic and Acousto-optic Laser Beam Scanners

There has been a significant driving force to eliminate the utilization, recycling, and disposal of ferroelectric ceramics with high content of toxic element (Pb). Recently, the ternary system of KNN-LT-LS has proven to be an outstanding lead-free piezoceramic with properties almost comparable to their lead-based counterpart, PZT. This study reports the effect of various processing conditions on the electromechanical properties of (K0.44Na0.52Li0.04)(Nb0.84Ta0.10Sb0.06)O3 system. This includes powder processing, humidity, and exposure to oxygen rich environment during sintering. The Perovskite and Mixed-Oxide methods are used to prepare the stoichiometric powders. It will be shown that both processing methods are notably sensitive to the moisture of as received raw materials and the humidity of environment. Optimum results are obtained when the raw materials undergo a pre-heat treatment followed by formulating the desired composition in an inert atmosphere. The highest electromechanical properties are achieved when the ceramics are completely exposed to oxygen with a high flow rate. Sintered at 1150 °C for 1 h with an oxygen flow rate of 180 cm3/min, the KNN-LT-LS ceramics prepared by Perovskite and Mixed-Oxide routes have d
 33 ≥ 300 pC/N, $$\varepsilon ^{T}_{{33}} = 1865$$
 , tan δ = 0.02, k
 33 = 0.65.

Property-processing relationship in lead-free (K, Na, Li) NbO3-solid solution system

Growth of cubic KTa1−xNbxO3 crystal by Czochralski method

Growth and characterization of cubic KTa1-xNbxO3 crystals

The optical properties of NdxGd1-xAl3(BO3)4(NGAB) crystal are reported. The refractive index of it were mesured by V-prism method. The absorption spectra and the flourescence specra of NGAB were also obtained. The optical parameters of NGAB were calculated following J-O theory, the three optical parameters are Ω2 = 1.805 × 10−20, Ω4 = 1.85 × 10−20, Ω6 = 3.793 × 10−20(RMS= 1.4 × 10−7) and βc(4F3/2 →4I11/2) is about 0.53.

Optical properties of NdxGd1-xAl3(BO3)4 crystal

Growth, etching, polarization and second harmonic generation of potassium lithium tantalate niobate crystals

Self-pumped phase conjugation with high reflectivity by stimulated forward- and backward-scattering tetragonal potassium tantalate niobate crystal

Growth defects in flux grown RbTiOAsO4 crystals observed with white-beam synchrotron radiation topography

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