2-4 inch SAW grade LiTaO3 (LT) Wafer
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2-4 inch SAW grade LiTaO3 (LT) Wafer

Lithium tantalate (LiTaO3) crystal is a colorless and transparent or pale yellow crystal material. LT crystal integrates various effects such as piezoelectric, electro-optic, acousto-optic, nonlinear optics, etc., and is an excellent sound transmission medium and high-frequency transducer material. It can be widely used in electro-optical devices, laser frequency multipliers, acousto-optical devices, etc.
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Product Description

Specifications:

Cutting Angle

X/Y/Z/Y36/Y42/Y46.3/Y48/X112 etc

Diameter/size

2”/50.8mm

3”/76.2mm

4”/100mm

Tol(±)

±0.25mm

Thickness

From 100um to 1000um

DoppingFe, etc

Primary reference flat

22mm or customized

32.5mm or customized

LTV (5mmx5mm)

< 2um

TTV

< 10um

Bow

±25um

Warp

≤ 30um

PLTV

≥95%(5mm*5mm)

Orientation Flat

All available

Surface Type

Fine Griding/Single Side Polished /Double Sides Polished

Polished side Ra

≤1nm

Back Side Criteria

General is 0.2-0.5um or as customized

Edge Rounding

Compliant with SEMI M1.2 Standard/refer to IEC62276


Crystal physical parameters: 


Crystal symmetry

Trigonal, 3m

Lattice constant, A

a = 5.154       c = 13.783

Density, g/cm3

7.45

Melting point , °C

1650

Curie point , °C

605

Mohs hardness

6

Thermal expansion coefficient, 10-6/ °C

aa = 16   ac = 4

Thermal conductivity , mW/cm °C

46

Dielectric Constant (@ 100 KHz)

ea = 54    ec = 43

Refractive indices @ 633 nm

no = 2.175   ne = 2.180

Pyroelectric Coefficient:

-2.3 10-4 C/°C/m2


Applications:


1. SAW grade LiTaO3 wafers are used in the manufacturing of substrates for RF type SAW devices, high frequency filters with a wide bandwidth.

2. SAW filters, resonators, Q switches, optical modulators, acousto-optic switches, etc.


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