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LiNbO3

LiNbO3 crystal combines low cost, good mechanical and physical properties as well as high optical homogeneity. Therefore, LiNbO3 wedges have been widely used in fiber isolators and circulators.
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CASTECH provides:

•  50,000 to 100,000 pcs/month of LiNbO3 wedges used for fiber optical isolators and circulators;
•  Reliable Delivery;
•  Strict quality control;
•  Technical support;
•  Very competitive price.

 

Table 1. Basic Properties of LiNbO3

Crystal Structure Trigonal, Space group R3c, Point group 3m
Melting Point 1253℃
Mohs Hardness 5
Density 4.64g/cm3
Deliquescence None
Optical Homogeneity ~5×10-5/cm
Transparency Range 420nm-5200nm
Absorption Coefficient ~0.1%/cm @ 1064nm
Refractive indices at 1064nm ne  = 2.146, no = 2.220 @ 1300 nm
ne  = 2.156, no = 2.232 @ 1064 nm
n= 2.203, no = 2.286 @ 632.8 nm
Thermal Expansion Coefficients(at 25℃) //a, 2.0×10-6/K
//c, 2.2×10-6/K
Thermal Conductivity Coefficient 38 W/m/K at 25℃
Thermal Optical Coefficient dno/dT=-0.874×10-6/K at 1.4 μm
dne/dT=39.073×10-6/K at 1.4 μm
The Sellmeier equations(λ in μm) no2 = 4.9048 + 0.11768/(λ2-0.04750) - 0.027169λ2
ne2 = 4.5820 + 0.099169/(λ2-0.04443) - 0.02195λ2

 

Table 2. Specifications of LiNbO3 wedges

Aperture 1.0×1.0 mm to  4×4 mm2
Dimension tolerance ±0.05mm
Wedge Angle tolerance ±0.1°
Optical axis orientation ±0.5°
Flatness λ/4 @ 632.8nm
Surface Quality 20/10
AR-coating R<0.2% @ 1550nm±40nm
Standard Size 1.25mm×1.25mm×0.5mm with 13°  or 15° wedge,phi=22.5°

 

Note: Other sizes and coatings are available upon request.

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