Concentration Dependence of Optical Properties of Double-Doped LiTaO:Cr:Nd Crystals.

LiTaO crystals doped with Cr and Nd ions are promising for developing active nonlinear laser media. In this work, the defect structure of LiTaO crystals, including those doped with Cr and Nd, is examined. X-ray patterns of all six investigated LiTaO:Cr:Nd crystals are identical and correspond to a highly perfect structure.

Features of the Defect Structure of the Compositionally Homogeneous Crystal LiNbO:Er(3.1 wt%) and the Gradient Crystal LiNbO:Er and Their Manifestation in the IR Transmission Spectra in the Region of Stretching Vibrations of Hydrogen Atoms of OH-Groups.

Based on the analysis of the IR transmission spectra in the region of stretching vibrations of hydrogen atoms of OH-groups, it was established that the oxygen-octahedral MeO clusters (Me-Li, Nb, vacant octahedron V, impurity ion) of the structure of the compositionally homogeneous crystal LiNbO:Er(3.1 wt%) and the gradient crystal LiNbO:Er(congruent composition by the main components, Er gradient of 0.55 at%/cm) have a shape close to the regular one.

Features of the defect structure of a lithium-gradient nonlinear optical single crystal LiNbO and their manifestation in the Raman spectra.

LiNbO crystal with a lithium composition gradient of Li/Nb = 0.8 wt%/cm (LiNbO) were obtained. A monotonic change in the edge of the UV absorption edge is observed when scanning the surface of the gradient crystal along the growth direction.

Stimulated boson-peak light scattering in an aqueous suspension of spherical nanoparticles of amorphous SiO of similar sizes.

A forward-directed high-efficiency stimulated inelastic light scattering was detected in an aqueous suspension of spherical nanoparticles (nanoballs) of amorphous SiO2 of similar sizes (0.25 μm) with a concentration of 1013 cm-3. In the stimulated scattering spectrum, there was an intense forward directed Stokes component with a frequency shift of 0.