LN
LiNbO3 (LN) crystal is widely used as frequency doublers for wavelength greater than 1000μm and optical parametric oscillators (OPOs) pumped at 1064 nm and quasi-phase-matched (QPM) devices. Besides, due to its unique electro-optical, photoelastic, piezoelectric and non-linear properties, Lithium Niobate is widely used in a variety of integrated and active acousto-optical devices.
Basic properties of LiNbO3 Crystal:
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Crystal Structure
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Trigonal , 3m
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Lattice Constant,A
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a=b=5.148A, c=13.863A
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Chemical Formula
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LiNbO3
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Grow method
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CZ
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Melting Point
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1250℃
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Density
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4.64g/cm3
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Curie Temperature
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～ 1140℃
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Mohs Hardness
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5
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Thermal Expansion
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a11 =15.4×10-6/K a33 =7.5×10-6/K
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Thermal Conductivity, W/(m K) at 300 K
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5.6
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Refractive Indices
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n0 =2.286 ne =2.203 @632.8nm
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Nonlinear Optical Coefficients, p/m/V at 1064 nm
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d31 = -4.5 d33 = -0.27 d22 = 2.1
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Electro-Optical Coefficients, pm/V at 633nm, high frequency
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r33 =31 r31=9 r22 =3.4
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Transmittance Range, nm
Transmittance |
370 ～ 5000nm
>68% @632.8nm |
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The Sellmeier equations（λ: um)
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n02(λ)=4.9048+0.11768/(λ2 -0.04750)-0.027169×λ2
ne2(λ)=4.5820+0.099169/(λ2 -0.04443)-0.021950×λ2 |
NLO Linear optics properties:
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NLO Coefficients
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d33 = 34.4 pm/V
d31 = d15 = 5.95 pm/V d22 = 3.07 pm/V |
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Efficiency NLO Coefficients
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deff =5.7 pm/V or ~14.6 x d36 (KDP) for frequency doubling 1300 nm;
deff =5.3 pm/V or ~13.6 x d36 (KDP) for OPO pumped at 1064 nm; deff =17.6 pm/V or ~45 x d36 (KDP) for quasi-phase-matched structure |
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Electro-Optic Coefficients
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gT33 = 32 pm/V, gS33 = 31 pm/V,
gT31 =10 pm/V, gS31=8.6 pm/V, gT22 = 6.8 pm/V, gS22= 3.4 pm/V, |
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Half-Wave Voltage, DC
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Electrical field ||z, light^z:
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Electrical field|| x or y, light ||z:
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3.03 KV
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4.02 KV
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Damage Threshold
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100 MW/cm2 (10 ns, 1064nm)
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