LiNbO3 (LN) Crystals

LiNbO3 (LN) Crystals
LiNbO3 (LN) Crystals

LiNbO3 (Lithium niobate, LN) crystal is a negative uniaxial crystal and one of the most thoroughly characterized optical materials. With its wide transparency range in the visible and mid-infradred and the excellent chemical and mechanical stability, LN crystal can be used as a bifrengent material for applications in infrared.

Both pure LN and MgO doped LN (MgO:LN) are available from Newlight Photonics.

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Basic Properties of pure LiNbO3:

Crystal Structure Trigonal, Space group R3C, Point group 3m
Cell Parameters a=5.148 Å , c=13.863 Å
Melting Point 1253oC
Curie Temperature 1140oC
Mohs Hardness 5
Density: 4.64 g/cm3
Deliquescence None
Optical Homogeneity ~ 5x10-5 /cm
Transparency Range 420 -- 5200 nm
Absorption Coefficient ~0.1%/cm @ 1064 nm
Refractive indices at 1064nm
(Pure LN)
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 Coefficient
(@ 25oC)
//a, 2.0x10-6/K
//c, 16.7x10-6/K
Thermal Conductivity Coefficient: 38 W/m/K at 250 oC
Thermal Optical Coefficient dno/dT=-0.874x10-6/K at 1.4 µm
dne/dT=39.073x10-6/K at 1.4 µm
The Sellmeier equations (Pure LN))
 (λ in µm)
no2 = 4.9048+0.11768/(λ2-0.04750)-0.027169λ2
ne2 = 4.5820+0.099169/(λ2-0.04443)-0.021950λ2


MgO doped LiNbO3 (MgO:LN) has similar linear optical properties to pure LiNbO3, but the photorefractive damage threshold is much higher.

The Sellmeier equations of MgO:LN  are:

MgO dopant 5 mol%


no2 = 4.9017+0.112280/(λ2-0.049656)-0.039636λ2
ne2 = 4.5583+0.091806/(λ2-0.048086)-0.032068λ2

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