Engineering Overview

Optical Grade Lithium Tantalate Wafers

Lithium tantalate wafers, also known as LiTaO3 wafers, are single crystal substrates used for SAW devices, RF filters, pyroelectric infrared detectors, electro-optic components, nonlinear optics, and precision photonics applications. ATR Crystal supplies 2 inch, 3 inch, 4 inch, and 6 inch LiTaO3 wafers with X-cut, Y-cut, Z-cut, and custom orientations, including SSP or DSP polishing, controlled thickness, TTV, bow, warp, surface roughness, primary flat, and wafer-box packaging. Custom MgO, Fe, Zn doped LiTaO3 wafers, boules, blanks, and optical components can also be reviewed according to drawings.

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LiTaO3 Lithium Tantalate Wafers for SAW and Optical Applications

Optical grade lithium tantalate wafers, also written as LiTaO3 wafers or lithium tantalate single crystal substrates, are used in SAW devices, pyroelectric infrared detectors, electro-optic components, nonlinear optical devices, gyro sensors, and precision photonics substrates.

LiTaO3 offers stable mechanical and chemical properties, high optical damage threshold, and useful piezoelectric, pyroelectric, electro-optic, and nonlinear optical behavior. Wafer performance depends on cut orientation, diameter, thickness, polishing type, TTV, bow, warp, roughness, edge quality, and particle control.

ATR Crystal supplies LiTaO3 wafers in 2 inch, 3 inch, 4 inch, and 6 inch formats, with X-cut, Y-cut, Z-cut, and custom orientations available for engineering review. Fe, Zn, MgO, and other doped LiTaO3 wafers, boules, blanks, and customized optical components can also be discussed according to drawings and application requirements.

Applications of Lithium Tantalate Wafers

SAW devices, RF filters, and acoustic wave substrates

Pyroelectric infrared detectors and thermal sensing elements

Electro-optic modulators and photonic components

Quasi-phase-matching, SHG, OPO, and wavelength conversion projects

Gyro sensors, optical devices, and precision instrument substrates

Custom optical wafers, blanks, boules, and polished components

Advantages of LiTaO3 Wafers

Piezoelectric and SAW performanceLiTaO3 is widely used as a substrate material for SAW and RF filter devices where cut angle, orientation tolerance, and surface quality are critical.
Pyroelectric responseLithium tantalate is used in pyroelectric infrared detection and thermal sensing applications.
Optical and nonlinear propertiesLiTaO3 can be used in electro-optic and nonlinear optical applications, including wavelength-conversion and photonics research.
Stable crystal substrateThe material provides stable mechanical and chemical properties for precision wafer and optical component processing.
Custom cut and polishingX-cut, Y-cut, Z-cut, custom orientations, SSP, DSP, low roughness, and wafer flatness requirements can be reviewed.
Wafer-grade inspectionDiameter, thickness, TTV, bow, warp, flat length, edge condition, particles, scratches, and surface defects can be specified for quotation.

Available LiTaO3 Wafer Options

Common supply options for lithium tantalate wafers and crystal substrates.

Item	Available Option	Design Notes
Diameter	2 inch, 3 inch, 4 inch, 6 inch	Availability depends on orientation, thickness, grade, and quantity.
Orientation	X-cut, Y-cut, Z-cut, and custom cuts	SAW and optical applications may require specific cut angle and flat orientation.
Thickness	0.18 mm and above; common values include 0.25 mm, 0.5 mm, and 1.0 mm	Thickness tolerance and TTV should be confirmed with wafer diameter.
Surface type	SSP or DSP	Single-side or double-side polishing should be selected according to device process.
Doped options	Fe, Zn, MgO doped LiTaO3 wafers	Doped materials should be confirmed by application, availability, and drawing.
Product form	Wafers, boules, blanks, customized optics	Custom shapes and optical components can be reviewed case by case.

Product Parameters of Lithium Tantalate Wafers

The following values summarize typical LiTaO3 wafer parameters for engineering review. Final limits depend on wafer diameter, thickness, orientation, polishing type, and inspection standard.

Parameter	Typical Value / Option
Material	LiTaO3 single crystal
Curie temperature	Approx. 603 +/- 2 C
Cutting angle	X, Y, Z, and custom cuts
Orientation tolerance	<= +/-15 arcmin, or tighter by review
Diameter	2 inch, 3 inch, 4 inch, 6 inch
Diameter tolerance	<= +/-0.20 mm
Thickness	0.18-0.5 mm or more; custom thickness available
Thickness tolerance	<= +/-0.025 mm, depending on wafer size and thickness
Primary flat length	16 mm, 22 mm, 32 mm, or custom flat by wafer standard
TTV	Typically 1-5 um depending on wafer size, thickness, and grade
Bow	Typically within +/-25-40 um depending on wafer size and thickness
Warp	<= 35 um, depending on wafer size and grade
Orientation flat	According to ATR Crystal standard or customer drawing
Surface type	Single-side polished, SSP; double-side polished, DSP
Polished side Ra	<0.5 nm
Polished side surface quality	S/D 20/10
Edge criteria	Compliant with SEMI M1.2 or IEC 62276 reference, depending on order requirement
Quality	Free of cracks; bubbles and inclusions to be controlled by agreed inspection criteria
Optical doping	Zn, MgO, Fe, or other options by review
Wafer surface contamination	None by agreed inspection condition
Particles	Particles larger than 0.3 um: <= 30, if specified in the order
Scratch and chipping	None by agreed inspection criteria
Defects	No edge cracks, scratches, saw marks, or stains by agreed inspection criteria
Packaging	Typically 25 pcs per wafer box, or custom packing on request

LiTaO3 vs. Related Crystal Wafer Materials

LiTaO3 is often selected for SAW, pyroelectric, electro-optic, and nonlinear optical applications. Lithium niobate and quartz wafers may be preferred when the project requires different acoustic, optical, electro-optic, thermal, or cost characteristics.

Material	Common Use	Main Advantage	Design Notes
LiTaO3	SAW devices, pyroelectric sensors, optical and nonlinear components	Good piezoelectric, pyroelectric, electro-optic, and chemical stability characteristics	Cut angle, orientation tolerance, TTV, bow, warp, and surface roughness are critical.
LiNbO3	Electro-optic modulators, photonics, nonlinear optics, SAW devices	Strong electro-optic and nonlinear optical properties	Often selected for integrated optics, modulation, and frequency-conversion work.
Quartz	SAW filters, resonators, optical windows, precision substrates	Excellent thermal stability, low loss, and mature wafer processing	Orientation such as ST-cut or 42.75 degree Y-X cut must be specified for SAW applications.
MgO:LiTaO3	Optical and nonlinear applications	Doping can improve photorefractive-damage resistance in suitable applications	Doping level and process requirements should be confirmed before quotation.
Fe:LiTaO3 / Zn:LiTaO3	Special optical and research applications	Dopant-dependent optical behavior	Availability and specifications should be reviewed case by case.

How to Specify Lithium Tantalate Wafers

For LiTaO3 wafer orders, the most important specifications are material grade, cut orientation, orientation tolerance, diameter, thickness, thickness tolerance, TTV, bow, warp, surface type, roughness, edge criteria, primary flat, particle control, and packing method. For SAW devices, the exact cut angle and flat orientation are especially important. For optical and nonlinear applications, surface quality, optical doping, coating, and transmission requirements should also be confirmed.

If the wafer will be used in a production device process, provide the full drawing, wafer standard, surface inspection requirement, cassette or wafer-box requirement, and any SEMI or IEC reference. For prototype work, application details and target performance help choose a practical specification without unnecessary cost.

LiTaO3 Wafer RFQ Checklist

Providing the following information helps ATR Crystal review feasibility and quote more accurately.

RFQ Item	Information to Provide
Application	SAW device, pyroelectric detector, electro-optic component, nonlinear optics, sensor, or custom substrate.
Material and doping	Undoped LiTaO3, MgO:LiTaO3, Fe:LiTaO3, Zn:LiTaO3, or other doped material requirement.
Orientation	X-cut, Y-cut, Z-cut, rotated cut, orientation tolerance, primary flat direction, and flat length.
Wafer geometry	Diameter, thickness, thickness tolerance, TTV, bow, warp, bevel, and edge criteria.
Surface requirement	SSP or DSP, Ra, scratch-dig, particle limit, contamination limit, and visual defect criteria.
Order information	Quantity, wafer box requirement, inspection report requirement, packaging, delivery schedule, and drawing.

Frequently Asked Questions

What are lithium tantalate wafers used for?

LiTaO3 wafers are used for SAW devices, RF filters, pyroelectric infrared detectors, electro-optic components, nonlinear optics, gyro sensors, and precision photonics substrates.

What orientations are available for LiTaO3 wafers?

Common orientations include X-cut, Y-cut, Z-cut, and custom rotated cuts. The correct cut depends on SAW, optical, pyroelectric, or electro-optic device requirements.

Can ATR Crystal supply SSP and DSP LiTaO3 wafers?

Yes. Single-side polished and double-side polished LiTaO3 wafers can be reviewed according to surface roughness, TTV, bow, warp, and visual inspection requirements.

How does LiTaO3 compare with LiNbO3?

Both are important functional crystal wafer materials. LiTaO3 is widely used for SAW and pyroelectric applications, while LiNbO3 is often selected for electro-optic modulation, photonics, and nonlinear optics. Final selection depends on device design and specification.

What information is needed for a LiTaO3 wafer quotation?

Please provide material type, cut orientation, diameter, thickness, TTV, bow, warp, polishing type, Ra, flat length, edge criteria, quantity, drawing, and packaging requirement.

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