LiNbO3 crystals have become one of the most commonly used material for Q-switches and phase modulators for its high EO coefficients, with an electric field applied transverse to the direction of light propagation, LiNBO3 cells can be configured to operate at a lower voltage than comparable KD*P cells. LiNbO3 can also be a good choice for infrared wavelengths as long as 3.0µm. Hangzhou Shalom EO offers the polished, and AR coating and Au-Cr electroded LiNbO3 crystals used in pockels cells.
Preferably for Er:YAG-, Ho:YAG-, Tm:YAG laser.
Wavelengths up to 3μm.
Brewster for laser with low amplification.
Common Specifications:
| Crystal Materials | LiNbO3 crystals | Size | Customized |
| Size Tolerance | +/-0.1mm | Length Tolerance | +/-0.2mm |
| Surface Quality | 20/10 S/D | Parallelism | <20 arc seconds |
| Flatness | < Lambda/10 @633nm | Chamfer | 0.1-0.3mmx45° |
| Chips | <0.15mm | Side Surface | Fine ground |
| Orientation Tolerance | < 10 arc minutes | Wavefront Distortion | <Lambda/4@633nm |
| Extinction Ratio | >200:1 | Coating | AR/AR@1064nm or customized |
| Damaging Threshold | >100mW/cm^2@1064nm 10nS 10Hz pulse | Electrode on Side Surface | Chrome gold electrode (Cr+Au) |
Basic Properties:
| Crystal Structure | Trigonal, space group R3c | Cell Parameters | a = 0.515, c = 13.863, Z = 6 |
| Melting Point | 1255±5℃ | Curie Point | 1140±5℃ |
| Mohs Hardness | 5 | Density | 4.64 g/cm3 |
| Absorption Coefficient | ~ 0.1%/cm @ 1064nm | Solubility | insoluble in H2O |
| Relative Dielectric Constant | eT11/e0: 85 eT33/e0: 29.5 |
Thermal Expansion Coefficients( @ 25℃) | ||a, 2.0 x 10-6 /K ||c, 2.2 x 10-6 /K |
| Thermal Conductivity | 38 W /m /K @ 25℃ | ||
Linear Optical Properties:
| Transparency Range | 420-5200nm | Optical Homogeneity | ~ 5 x 10-5 /cm |
| Refractive Indices | ne=2.146, no = 2.220 @ 1300nm ne= 2.156, no = 2.232 @ 1064nm ne= 2.203, no = 2.286 @ 632.8nm |
Sellmeier Equations (λ in mm) |
n2o (l) = 4.9048+0.11768/(l2 - 0.04750) - 0.027169l2 n2e (l) = 4.5820+0.099169/(l2 - 0.04443) - 0.021950l2 |
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 1300nm deff =5.3 pm/V or ~13.6 x d36(KDP) for OPO pumped at 1064nm 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 |
LiNbO3 crystals with bruster angle:
