After having analyzed the different causes of macroscopic displacements of photocarriers in LiNbO 3, the corresponding photoinduced changes of refractive index are computed for the short-circuited and open circuited crystal. It is shown in the second case that total or selective erasure can be performed, using a coherent substraction technique. REVUE DE PHYSIQUE APPLIQUÉE TOME 10, NOVEMBRE 1975...

We present a first-principles density functional theory study predicting the relative thermodynamic stability of ferroelectric lithium niobate (LiNbO3) (0001) surfaces of different stoichiometry. We predict that the equilibrium stoichiometries are different for the positively and negatively polarized LiNbO3 surfaces under the same conditions. Based on the modern theory of polarization, we demon...

Organic-inorganic hybrid materials can be prepared dispersing organic species into well-defined inorganic nanoblocks. This paper describes the immobilization of natural dyes from the extract of the Brazilian açaí-fruit into two types of layered hexaniobate precursors derived from H(2)K(2)Nb(6)O(17): (i) colloidal dispersion of niobate exfoliated nanoparticles and (ii) niobate pre-intercalated w...

Ruthenium (Ru) doped lithium niobate (LiNbO3) single crystal was grown by the Czochralski method from a congruent melt composition. The color of the Ru: LiNbO3 was red and darkened with the increasing Ru concentration. The amount of Ru concentrated in the grown crystal gradually decreased along the pulling direction because the effective segregation coefficient of Ru in lithium niobate is great...

(De)Multiplexing Technologies In article number 2100529, Yonghui Tian, Arnan Mitchell, Yikai Su, and co-workers experimentally demonstrated mode polarization-division multiplexing on a thin-film lithium niobate insulator (LNOI) platform. By introducing silicon nitride as loading material atop the LNOI photonics chip, devices can be integrated with high-speed electro-optic modulators to achieve ...

We describe an experimental system that programs three-dimensional optical fields to 200-fs resolution over a 10-ps window by using photorefractive volume reflection holograms in lithium niobate. These pulsed images are detected with an imaging interferometric cross correlator.

We use mode multiplexing and demultiplexing in apodized aperiodically poled lithium niobate waveguides to enable characterization of picosecond optical pulses in a collinear but background-free way using autocorrelation and second-harmonic frequency-resolved optical gating.

An algorithm to control the biasing of a lithium niobate optical 90° hybrid for coherent detection was embodied in hardware. The control was able to provide optimal biasing with either homodyne or differential detection.

We demonstrate spatial solitons via twin-beam second-harmonic generation in hexagonal lattices realized by poling lithium niobate planar waveguides. These simultons can be steered by acting on power, direction, and wavelength of the fundamental frequency input.

We conducted a series of calorimetric experiments with nominally pure lithium niobate single crystals congruent composition from different manufacturers and cuts, the samples were exposed to temperatures up 1100 ℃. For all samples, temperature feature is observed in range 800–900 °C, regardless their crystallographic orientation. The calculated activation energy about 150 kJ/mol indicates diffu...