Li:NbO3

Li:NbO3

Li:NbO3 is a low cost crystal with good physical and mechanical properties. LiNbO3 wedges are widely used in fiber isolators and circulators. 

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

 

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
ne  = 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

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