Abstract
Large size high quality LiNbO3 single crystals were grown successfully by tilting-mirror-type floating zone (TMFZ) technique. The grown crystals were characterized by X-ray diffraction, etch pits density measurement, Impedance analysis, Vibrating sample magnetometry (VSM) and UV-Visible spectrometry. The effect of mirror tilting during growth on the structural, electrical, optical properties and defect density of the LiNbO3 crystals were investigated. It was found that the defect density in the crystals reduced for tilting the mirror in the TMFZ method. The chemical analysis revealed that the grown crystals were of high quality with uniform composition. The single crystals grown by TMFZ method contains no low-angle grain boundaries, indicating that they can be used for high efficiency optoelectronic devices.
Highlights
Lithium niobate, LiNbO3 (LN) is an important ferroelectric material that has found applications in a wide range of optoelectronic devices, laser physics, holography, and acoustics 1,2
We reported that the interface shape can be controlled by tilting the mirror in the tilting-mirror-type floating zone (TMFZ) method as shown in fig
LiNbO3 single crystal is important in broad areas of technological applications, the details of the physical properties and crystal structure are not readily available in literature
Summary
LiNbO3 (LN) is an important ferroelectric material that has found applications in a wide range of optoelectronic devices, laser physics, holography, and acoustics 1,2. LN single crystals are important materials for optical waveguides, mobile phones, piezoelectric sensors, optical modulators, photorefractive devices, optical frequency multipliers, surface acoustic wave devices and various linear and non linear optical applications 3-7. It has negative uniaxial birefringence which depends slightly on the stoichiometry and strongly on the crystal structure and temperature 8. CZ grown crystals may contain some dislocations and subgrain boundaries These defects seriously affect many physical properties and limit practical applications 3. We try to grow high quality LiNbO3 single crystal by TMFZ method for optical device applications. This report deals with the merit of TMFZ method for growing large size LiNbO3 crystals with reduced dislocations and subgrain boundaries. The main aim of this work is the growth of optically homogeneous single domain LiNbO3 crystals for high performance device applications
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