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  • LiTaO3

  • LiTaO3 is an E-O crystal widely used for E-O devices, due to its good optical NLO and E-O properties, as well as high damage threshold. CASTECH supplies high quality LiTaO3 boules and wafers with the following specifications for standard applications. We can also offer other specifications upon request.
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Basic Properties of LiTaO3

 

Crystal Structure Trigonal, Space group R3c, Point group 3m         
Cell Parameters a=5.154Å,c=13.781Å
Melting Point 1650℃
Curie Temperature 607℃
Mohs Hardness 5.5
Density 7.46g/cm3
Dielectric Constants

ε110:51.7

ε330:44.5

Elastic Stiffness Coefficients

CE11:2.33(×1011N/m2

CE33:2.77(×1011N/m2

Piezoelectric Strain Constants

d22:2.4(×10-11C/N)

d33:0.8(×10-11C/N)

Transmission range 400-4500nm
Electro-optical coefficients r33=30.4pm/V
Refractive index at 632.8nm          no=2.176,ne=2.180

 

Typical Specifications:

 

Type

Specifications

Boule Wafer
Diameter Φ3″   Φ3″ Φ4″
Length or Thickness ≤100mm ≤50mm 0.35-0.5mm
Orientation 127.86°Y,64°Y,135°Y,X,Y,Z,and other cut      
Ref. Flat Orientation X,Y
Ref. Flat Length 22±2mm 2mm 22±2mm 32±2mm
Front Side Polishing   Mirror polished 5-15Å
Back Side Lapping   0.3-1.0μm
Flatness(μm)   ≤15
Bow(μm)   ≤25

 

 

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