Crystals Materials
BBO Crystal
for aerospace, medical, and industrial applications
β-BBO crystal (Beta barium borate) is one of the best non-linear optical crystals with high effective nonlinear optical coefficient, high damage threshold, wide phase matching range and high deep UV transmittance.
BBO crystal is a negative uniaxial crystal, and its o-ray refractive index (no) is larger than the e-ray (ne) refractive index.
| Thickness/Diameter Tolerance | ±0.05 mm |
| Orientation Tolerence | < 0.5° |
| Size | 3 mm ~ 150 mm or Upon customer request |
| Dimension Tolerances | ±0.05 mm |
| Surface Quality | 10/5 S/D per MIL-O-13830A |
| Parallelism | < 10 arcsec |
| Perpendicularity | < 5 arcmin |
| Clear Aperture | > 90% |
| Wavefront Distortion | λ/8 @ 633 nm |
| Surface Flatness | < λ/8 @ 632.8 nm |
| Chamfer | < 0.1 mm @ 45° |
| Coating | AR/HR/PR coating upon customer's request |
| Chemical Formula | BaB2O4 |
|---|---|
| Crystal Structure | Trigonal, Space Group R3c |
| Lattice Constant | a=b=12.532Å, c=12.717Å, Z=6 |
| Density | 3.85 g/cm3 |
| Melting Point | About 1095℃ |
| Thermal Conductivity (W/m/k@25°C) | ⊥c: 1.2 W/m/K; //c: 1.6 W/m/K |
| Thermal Expansion Coefficients | α11=4 x 10-6/K; α33=36x 10-6/K |
| Hardness (Mohs) | 4 |
| Birefringence | negative uniaxial |
| Transparency Range | 190 nm - 3500 nm |
| SHG Phase Matchable Range | 409.6 nm - 3500 nm (Type I), 525 nm - 3500 nm (Type II) |
| Therm-optic Coefficient (/℃, λ in μm) | dno/dT=-16.6x 10-6/℃, dne/dT=-9.3x 10-6/℃ |
| Absorption Coefficients | < 0.1%/cm(@1064 nm), <1%/cm(@532 nm) |
| Angle Acceptance | 0.8 mrad·cm (θ, Type I, 1064 SHG); 1.27 mrad·cm (θ, Type II, 1064 SHG) |
| Temperature Acceptance | 55℃·cm |
| Spectral Acceptance | 1.1 nm·cm |
| Walk-off Angle | 2.7° (Type I 1064 SHG); 3.2° (Type II 1064 SHG) |
| NLO Coefficients | deff(I)=d31sinθ+(d11cos3Φ- d22 sin3Φ) cosθq; deff (II)= (d11 sin3Φ + d22 cos3Φ) cos2θ |
| Sellmeier Equations (λ in μm) | no2=2.7359+0.01878/(λ2-0.01822)-0.01354λ2; ne2=2.3753+0.01224/(λ2-0.01667)-0.01516λ2 |
| Electro-optic coefficients | γ22 = 2.7 pm/V |
| Half-wave voltage | 7 KV (@1064 nm, 3x3x20 mm3) |
| Resistivity | >1011 ohm·cm |
Stock specification list
If need other specifications and quantities products, please contact us(sales@aogcrystal.com).
AR/HR/PR coatings are available at your specified wavelength.
Be sure to wear laser safety goggles when checking optical path and adjusting optical axis.
BBO is relatively soft and therefore requires precautions to protect its polished surfaces.
When angle adjusting is necessary, keep in mind that the acceptance angle of BBO is small.
| Part Number | Size | Theta, θ | Phi, φ | Coating S1/S2 | Application |
|---|---|---|---|---|---|
| BBO-Cry-001 | 10x10x0.1 mm | 29.2 | 90 | AR@400-800/400-800 nm | SHG@800 nm |
| BBO-Cry-002 | 6x6x0.1 mm | 44.3 | 90 | AR@400-800/266 nm | SHG@800 nm |
| BBO-Cry-003 | 6x6x1 mm | 22.0 | 0 | AR@515 nm | OPA |
| BBO-Cry-004 | 6x6x1.0 mm | 44.3 | 90 | AR@400-800/266 nm | THG@800 nm |
| BBO-Cry-005 | 6x6x1.0 mm | 47.6 | 90 | AR@532/266 nm | SHG@532nm |