Barium Titanate single crystal is an excellent photorefractive material which has high SPPC (Self pumped Phase Conjugation) reflection and two wave mixing (optical amplification) efficiency, It is important for information processing and image storage. Besides that it is also an important substrate material for some special film as its unique ferroelectric and other properties.
The followings are important for the use of BaTiO3, both for the bulk device and substrate:
1.The tetragonal BaTiO3 single crystal (the useful phase for both photorefractive effect and substrate) will change the phase when its temperature is lower than 13℃ or higher 125℃, so it is necessary to keep its temperature in the safe range during its using, storage and transportation.
2.The extra force such as compacting, cracking will cause a phase transition.
3.Poling is needed for (001)orientation substrate, while is not necessary for （100）、（110）、（111）orientations.
4.Normally the maximum size for BaTiO3 substrate is 10x10mm; the thinnest thickness is 0.3mm.
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BaTiO3 in growing
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Boules
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Finished Products
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Typical Properties:
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Crystal Structure
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Tetragonal(4m) 13oC<T<132 oC
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Cell parameter
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a=3.99Å,c=4.04Å,(at 26 oC)
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Melting Point
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1891 oK
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Density
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6.06 g/cm3 (at 26 oC)
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Specific Heat
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0.527J/g·k(300°K)
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Thermal conductivity
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6 W/m·k(300°K)
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Thermal expansion
(10-6k-1）
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15.7∥a 6.2∥c
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Dielectric constant（εr）
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εa=3000 εc=800
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Hardness（Mohs）
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4.5
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Growth Method
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TSSG(Top Seeded Solution Growth)
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Index of Refraction
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515 nm
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633 nm
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800 nm
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no
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2.4912
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2.4160
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2.3681
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ne
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2.4247
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2.3630
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2.3235
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Transmission wavelength
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0.43 - 6.30 um
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Electro Optic Coefficients
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rT13=8+/-2 pm/V
rT33=105+/-10 pm/V
rT42= 1300+/-100 pm/V
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Reflectivity of SPPC
( at 0 deg. cut )
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50-70 % (Ce: BaTiO3) for lamda = 515 nm
40-60% (PureBaTiO3) for lamda = 515 nm
50-80 % (Ce: BaTiO3) for lamda = 633 nm
40-60% (PureBaTiO3) for lamda = 633 nm
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Two-wave mixing coupling constant
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10-40 cm-1
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Absorption loss
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Lamda: 515 nm 633 nm 800 nm
a: 0.285cm-1 0.108cm-1 0.033cm-1
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Wavelength range for photo refractive effect
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Undoped BTO :for visible
Ce:BTO:480-780nm
Rh:BTO:720-1060nm
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Specifications:
Standard Size: 10x10，10x5，10x3,5x5 mm,
Thickness: 0.5mm，1.0mm.
Polishing: one or two side polished
Bulk: 5x5x5,4x4x4,3x3x3 mm, 0°or 45°cut,2-6 faces polished
Orientation: ＜100＞, ＜110＞, ＜001＞, ＜111＞
Orientation accuracy: ±0.5°
Other sizes are available upon request.
中文版
English
BaTiO3 Single Crystal
