Electro-Optical Devices, Multiplier and Acousto-Optic Devices-Litao3 Crystal

Product Description

LiTaO3 crystal is also widely used E-O crystal, due to its optical, NLO and E-O poperties similar to those of LiNbO3 crystal, but with 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.

Maximum LiTaO3 SAW wafer size we can offer is 6 inch in diameter.

Red Optronics provide LiTaO3 in as-cut boules, wafers or slices. Our production capabilities include:

Boules: 

• Diameter: f40mm ~ 102mm 
• Length: 50mm ~ 150mm 
• Orientation: X, Z, 36°Y, 42°Y, 128°Y 
• Polish: 0.016mm 

Wafers: 

• Diameter: f40mm ~ 102mm 
• Length: 0.2~1.2mm 
• Orientation: X, Z, 36°Y, 42°Y, 128°Ys 
• Flatness: 
  <10mm for f40 ~ 65mm
  <15mm for f65 ~ 102mm 
• Bow: 
  <20mm for f40~ 65 mm, 
  <40mm for f65 ~102mm 

Slices: 
Size: 100x45x1.5mm ~ 120x40x2mm 




 

Boule Specifications
Typical Diameter	φ3"±2mm	φ4"±2mm
Typical Length	≤120mm	≤100mm
Typical Orientation	36°Y,42°Y,

 

Wafer Specifications
Diameter	φ3"±2mm,φ4"±2mm
Thickness	0.3~1mm
Orientation	36°Y,42°Y
Reference Flat Orientation	X
Ref.Flat Width	22±2
Front Side Polishing	0.25~0.016μm
Back Side Lapping	10~15μm
Flatness (μm)	≤20
Bow (μm)	≤30

Notes: 
To inquire or order LiTaO3 crystals, please provide specifications as detailed in above.
 

Physical and Optical Properties
Crystal Structure:	Trigonal, space group R3c,Point group 3m
Cell Parameters:	a=5.154A,c=13.781A
Melting point:	1650°C
Curie Temperature:	607°C
Mohs hardness:	5.5
Density:	7.46 g/cm3
Dielectric Constant:	ξ11/ξ0 51.7 ξ33/ξ0 44.5
Elastic Stiffness Coefficient:	C^E11 2.33(X 10^11 N/m^2) C^E33 2.77(X 10^11 N/m^2)
Piezoelectric Strain Constant:	d22 2.4(X 10^-11 C/N) d33 0.8(X 10^-11 C/N)
Transmission range:	400-4500nm
Electro-optical coefficients:	r33 30.4pm/V
Refractive index at 632.8nm:	no=2.176, ne=2.180 Aperture

 

SAW Properties
Cut Type	νs(m/s)	κ^2s(%)	TCV(10-6/°C)	TCD(10-6/°C)
X-112°Y	3295	0.75	-16.50	22.3
Y-Z	3230	0.66

Innovation point: Through the crystal growth machine's modification in rotating and lifting system, the stability of crystal growth interface and growth rate become higher. Also the defects caused by the influence of crystal rotating and rising disturbance on the solid-liquid interface during the crystal growth process are reduced. we create simulation of crystal growth system and can design crystal shape. The computer chip control the changing of crystal shape according to crystal growth status, through the processing of precision sensor signals. The ultra low gradient interface growth temperature field we self-designed make the quality of optical crystals much better.
Optical grade lithium tantalate crystals and wafers

Lithium tantalate optical film
Various lithium tantalate LT shaped blocks

Photos:

SAW Level LT ingot


Optical LT wafers




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