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LiNbO3 Crystals
Description
LiNbO3: Crystal is widely used as frequency doublers for wavelength > 1 mm and optical parametric oscillators (OPOs)
pumped at 1064 nm as well as quasi-phase-matched (QPM) devices. Due to its large Electro-Optic (E-O) and Acousto-
Optic (A-O) coefficients.
1. Basic Properties
 
Crystal Structure Trigonal, space group R3c
Cell Parameters a = 0.515, c = 13.863, Z = 6
Melting Point 1255±5oC
Curie Point 1140±5oC
Mohs Hardness 5
Density 4.64 g/cm3
Absorption Coefficient ~ 0.1%/cm @ 1064 nm
Solubility: insoluble in H2O
Relative Dielectric Constant eT11/e0: 85
eT33/e0: 29.5
Thermal Expansion Coefficients( @ 25oC) ||a, 2.0 x 10-6/K ||c, 2.2 x 10-6/K
Thermal Conductivity 38 W /m /K @ 25oC

2. Linear Optical Properties
 
Transparency Range
420-5200nm


LiNbO3 Transparency Curve
Refractive Indices
ne=2.146, no = 2.220 @ 1300 nm
ne= 2.156, no = 2.232 @ 1064 nm
ne= 2.203, no = 2.286 @ 632.8nm
Optical Homogeneity ~ 5 x 10-5 /cm
Sellmeier Equations (l in mm):
n2o (l) = 4.9048+0.11768/(l2 - 0.04750) - 0.027169l2
n2e (l) = 4.5820+0.099169/(l2 - 0.04443) - 0.021950l2

3. Nonlinear Optical Properties

NLO Coefficients d33 = 34.4 pm/V
d31 = d15 = 5.95 pm/V
d22 = 3.07 pm/V
Efficiency NLO Coefficients 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.
Electro-Optic Coefficients 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,
Half-Wave Voltage, DC
Electrical field||z, light ^z:
Electrical field||x or y, light||z:
3.03 KV
4.02 KV
Damage Threshold 100 MW/cm2 (10 ns, 1064nm)
 
 
4. Standard Specifications of laser grade LiNbO3 crystals:
 
 
Transmitted wavefront distortion better than l/4 @ 633nm
Dimension tolerance (W±0.1mm) x (H±0.1mm) x (L±0.2mm)
Clear aperture over 90% central diameter
Flatness l/8 @ 633nm
Surface quality 20 /10 Scratch/Dig
Parallelism better than 20 arc sec
Perpendicularity 5 arc min
Angle tolerance Dq < 0.5o, Df < 0.5o
AR-coating dual wave band AR coating at 1064/532 nm on both surfaces, with R < 0.2% at 1064 nm
and R < 0.5% at 0.532 nm per surface 
 

Ms. Lin

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Ms.Chen