Uniform refractive index cladding for LiNbO3 single-crystal fibers

Abstract

A uniform refractive index cladding for LiNbO3 single-crystal fibers has been achieved using a Mg ion indiffusion process. This cladding has a uniform MgO concentration of ∼20 mol %, resulting in a uniform refractive index. The refractive indices of the cladding material have been evaluated to be ne=2.08 and no=2.09 at 0.6328 μm by using the light reflection technique.

Acoustic wave propagation along cladded fibers of trigonal crystal symmetry

“…where is the acoustic power of the th unperturbed mode (modal power): (5) is the coupling coefficient between the th and th unperturbed modes: (6) where the integrals cover the cross section, , and and and are densities and stiffness matrices of unperturbed and perturbed waveguides, respectively. The superscript * denotes complex conjugate.…”

“…Piezoelectricity is ignored in the calculation. Such LiNbO rods with lengths up to 20 cm have been obtained [5] and claddings can be made by using in-diffusion of MgO dopant [6], [7]. Our recent published exact solutions [8] for acoustic wave propagation in cladded hexagonal fibers are utilized as the approximation base.…”

Photoluminescence properties of Nd: LiNbO3 co-doped with ZnO fiber single crystals grown by micro-pulling-down method

“…Among these materials, long-length and small-diameter bulk crystals are of considerable interest for high efficiency and miniaturization. In particular, fiber single crystals have already received attention as attractive materials for a variety of electro-optical applications [1][2][3] because of their extended interaction length and high optical intensity. LiNbO 3 is a widely studied optoelectronic material because of its technological applications.…”

Fluorescence properties of Nd3+ doped stoichiometric LiNbO3 fiber single crystals by micro‐pulling down method

“…There is increasing interest in the growth of rod or fiber-like micro-single crystals, suitable for application in non-linear optical and electro-optical devices [1][2][3][4][5], such as second harmonic generation (SHG), micro-laser sources or optical memory arrangements. An improved efficiency can be expected because of the high surfacevolume ratio, the long interaction length and the high crystal quality [6][7].…”