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![[ Castech ]<Br>LiNbO3 - Lithium Niobate<br>Nonlinear Crystal](/thum_img/mjct/goods_img3/c4a07ef38d552d6b0cbd53d01665898f_water_4de0b559c44a49f5f544fca08f3bc282_c0_w500_h500.jpg)
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Introduction
Lithium Niobate (LiNbO3 or LN) is widely used as frequency doublers for wavelength＞1µm, optical parametric oscillators (OPOs) pumped at 1064 nm as well as quasi-phase-matched (QPM) devices. Additionally due to its large Electro-Optic (E-O) and Acousto-Optic (A-O) coefficients, LiNbO3 crystal is the most commonly used material for Pockel cells, Q-switches and phase modulators, waveguide substrates, and surface acoustic wave (SAW) wafers, etc. CASTECH can provide LiNO3 crystals with high quality and large size for all these applications.
CASTECH provides
- 50,000 to 100,000 pcs/month of LiNbO3 wedges used for fiber optical isolators and circulators
- Strict quality control
- Technical support
- Fast delivery
- Competitive price
Basic Properties
Table 1. Chemical and Physical Properties
|
Crystal Structure |
Trigonal, Space group R3c, Point group 3m |
|
Lattice Parameter |
a = 5.148 Å, c = 13.863 Å |
|
Melting Point |
1253℃ |
|
Curie Temperature |
1140℃ |
|
Mohs Hardness |
5 Mohs |
|
Density |
4.64 g/cm3 |
|
Elastic Stiffness Coefficients |
CE11 = 2.33 ( × 1011 N/m2) CE33 = 2.77 ( × 1011 N/m2) |
Table 2. Optical and Nonlinear Optical Properties
|
Transparency Range |
420-5200 nm |
|
Optical Homogeneity |
~5 ×10-5 /cm |
|
Refractive Indices |
ne = 2.146, no = 2.220 @1300 nm ne = 2.156, no = 2.232 @1064 nm ne = 2.203, no = 2.286 @632.8 nm |
|
NLO Coefficients |
d33 = 86 × d36 (KDP) d31 = 11.6 × d36 (KDP) d22 = 5.6 × d36 (KDP) |
|
Effective NLO Coefficients |
deff (I) = d31 sinθ - d22 cosθ sin3Φ deff (II) = d22 cos2θ cos3Φ |
|
Sellmeier Equations (λ in μm) |
no2 = 4.9048 + 0.11768 / (λ2 - 0.04750) - 0.027169 λ2 ne2 = 4.5820 + 0.099169 /(λ2 - 0.04443) - 0.02195 λ2 |
|
Damage Threshold |
100 MW/cm2 (10 ns, 1064 nm) |
Table 3. Thermal and Electrical Properties of LiNbO3
|
Thermal Conductivity |
38 W/m/K @25 ℃ |
|
Thermal Expansion Coefficients (at 25℃) |
//a, 2.0 × 10-6 /K //c, 2.2 × 10-6 /K |
|
Resistivity |
2×10-6 Ω·cm @200 ℃ |
|
Dielectric Constants |
εS11/ε0 = 43, εT11/ε0 = 78 εS33/ε0 = 28, εT33/ε0 = 32 |
|
Piezoelectric Strain Constant |
D22 = 2.04 × 10-11 C/N D33 = 19.22 × 10-11 C/N |
|
Electro-Optic Coefficients |
γT33 = 32 pm/V, γS33 = 31 pm/V, γT31 = 10 pm/V, γS31 = 8.6 pm/V, γT22 = 6.8 pm/V, γS22 = 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 |
Table 4. Specifications
|
Dimension Tolerance |
(W ± 0.1 mm) × (H ± 0.1mm) × (L ± 0.2mm) |
|
Clear Aperture |
Central 90% of the diameter |
|
Surface Quality (Scratch/Dig) |
20/10 to MIL-PRF-13830B |
|
Flatness |
λ/8 @633 nm |
|
Transmitted Wavefront Distortion |
≦ λ/4 @633 nm |
|
Parallelism |
20 arc sec |
|
Perpendicularity |
≦ 15 arc min |
|
Angle Tolerance |
≦ ±0.5° |
|
Quality Warranty Period |
One year under proper use |
AR-coatings
CASTECH provides the following AR-coatings:
- Dual Band AR-coating (DBAR) at 1064/532 nm on both surface, with low reflectance (R<0.2% @1064 nm and R<0.5% @532 nm)
- AR-coating and gold/chrome plated on side faces for E-O applications
- Other coatings are available upon request
