lithium tantalate crystal
Crystal growth, characterization, and domain studies in lithium niobate and lithium tantalate ferroelectrics
This chapter discusses the crystal structure and growth of noncongruent single crystals of lithium niobate and lithium tantalate using the double crucible Czochralski technique.
The chapter focuses on the phenomena of ferroelectric domains and discusses ferroelectric hysteresis, internal fields, the role of nonstoichiometry in domain reversal, the structure of a domain wall, and its interaction with lattice defects, and the phenomenological modeling of domain-wall structure in these materials.
Detailed experiment and theory of using Maker fringe analysis as a characterization tool for wafer thickness, composition, strain, and internal field variations over an entire 2–3-in wafer of LiNb03 or LiTa03 are also discussed.
From a technological viewpoint, the microengineering of ferroelectric domains for integrated optical applications also benefited from a real-time and nondestructive monitoring of the domain-engineering process during device fabrication.
lithium tantalate crystal structure
LiTaO3 crystal (Lithium Tantalate) Electro-Optical Crystal
LiTaO3 crystal is also a widely used E-O crystal, due to its optical, NLO, and E-O properties similar to those of LiNbO3 crystal, but with a higher damage threshold (> 500 MW/cm2 for ns pulsed).
Main properties include:
Transparent Range: 0.4 - 5.0 μm;
E-O Coefficient: r33=30.4;
Refractive Indices: no=2.176, ne=2.180 @ 633 nm.
The maximum LiTaO3 SAW wafer size we can offer is 6 inches in diameter.
Red Optronics provide LiTaO3 in as-cut boules, wafers, or slices.
lithium tantalate crystal structure
LiTaO3 Lithium Tantalate Crystal and Substrates
This LiTaO3 lithium tantalate crystal has >99.99% purity.
Find high-quality lithium tantalate bulk crystals, wafers, and substrates for sale at ALB Materials.
Lithium tantalate (LiTaO3) has a perovskite M6 crystal structure.
It has a unique combination of optical, piezoelectric, and pyroelectric properties.
The applications of lithium tantalate crystal include nonlinear optics, passive infrared (IR) sensors such as motion detectors, terahertz (THz) generation and detection, surface acoustic wave (SAW), just to name a few.
Both bulk crystals and crystal substrates are available for sale at MSE Supplies.
Please contact our scientists and engineers to discuss your specific requirements for lithium tantalate crystal and substrate products.
Typical product sizes available
up to 3-inch diameter and 50 mm thick
Crystal substrates/wafers (single side or double side polished)
2-inch diameter x 0.5mm thick
3-inch diameter x 0.5mm thick
Other sizes are available upon request
Undoped & doped Lithium Niobate (LiNbO3 or LNB) and Lithium Tantalate (LiTaO3 or LTA)
Lithium Niobate (LiNbO3 or LNB) and Lithium Tantalate (LiTaO3 or LTA) possess a combination of unique electro-optical, acoustic, piezoelectric, pyroelectric, and non-linear optical properties making it a suitable material for applications in acoustic, electro-optical and non-linear optical devices, high-temperature acoustic transducers, receivers-transmitters of acoustic vibrations, air force acceleration meters, acoustic wave delay lines, deflectors, generators of non-linear distorted waves, acoustic filters, electro-optical Q-modulators (Q-switch), encoders-decoders, filters in television receivers, video-recorders and decoders, converters, frequency doublers and resonators in laser systems, non-linear elements in parametric light generators, etc.
An indispensable condition of some of these applications is a high degree of optical uniformity of Lithium Niobate crystals used for the fabrication of active elements.
Crystal growth technology by low temperature-gradient Czochralsky method allows the growth of large-size high-quality LNB (up to 1-1.5 kg) and LTA single crystals for such non-conventional applications.
It should be noted that both crystals are non-hygroscopic, colorless, water-insoluble, and have low transmission losses.
LiNbO3 damage due to photorefractive effect in congruent melt grown LiNbO3 certainly limits its applications in high optical power devices.
For this purpose, specially grown LiNbO3 with composition near stoichiometric can be offered.
It is similar to the Li-rich VTE LiNbO3 with the obvious advantage that bulk samples can be obtained.
Another possibility to increase the laser damage threshold of LiNbO3 is doping with MgO.
Molech can offer both MgO: LiNbO3 and stoichiometric LiNbO3 elements cut from boules up to 60 mm dia.
Some other crystals of the LiNbO3 series are available, including LiNbO3 doped with Fe, Zn, Gd, Cu, Y, B, Er, etc.
For some applications similar in properties to Lithium Tantalate (LiTaO3) crystal is more advantageous than LiNbO3 (E-O modulators, pyroelectric sensors, etc.).
Lithium Tantalate exhibits unique electro-optical, pyroelectric, and piezoelectric properties combined with good mechanical and chemical stability and wide transparency range, and high optical damage threshold.
This makes LiTaO3 well-suited for numerous applications including electro-optical modulators, pyroelectric detectors, optical waveguide and SAW substrates, piezoelectric transducers, etc.
Molech can offer parts cut from high-quality boules grown along the X-axis, fully poled, with dia. and length of up to 60 mm.
Lithium Tantalate, LiTaO3 Properties & Specifications
Lithium Tantalate has unique properties, which as a material finds uses in Electro-Optical and Acousto-Optical applications.
These can be surface acoustic wave devices, bulk acoustic wave devices, piezoelectric transducers, and piezoelectric sensors.
The 36° and 42 ° cuts of Lithium Tantalate have shown widespread adoption for the telecommunications mobile phone handset market at frequencies from 800 to 2100 MHz.
These orientations show an optimized bandwidth/insertion loss trade-off in performance and are dominating the ever-expanding mobile handset sales.
For lower bandwidth, higher selection filters other orientations including the 112° rotated cut have shown great promise and are effectively covering the gap between Quartz (Ultra narrowband) and the 36/42 ° (wideband) models.
Both lithium niobate and lithium tantalate can be grown with different properties for differing applications, research projects, and production methods.
For example wafers free of pyroelectric discharge, 4" (100mm), orientation 36° or 42°.
Other specifications can be provided
Doped wafers: Er: LN, Zn: LN, and Fe: LN
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