BBO Nonlinear Crystal Beta-Barium Borate Crystal
BBO crystal transparency ranges from 188 nm to 5,2 µm, which includes reasonable transparency from 3-5,2 µm for few tens µm thick crystals, while their phase-matchable range spans almost over the entire transparency range. Combined with other magnificent properties of BBO, it is favorable for numerous nonlinear parametric applications. It is worth to mention that BBO crystals have the highest nonlinearity in the UV range out of all common nonlinear crystals.
Technical parameters of BBO
Tolerance of cutting angle | △θ≤±0.25°,△φ≤±0.25° |
Tolerance of dimension | Dimension+0/-0.1 mm，L：±0.1mm |
Flatness | λ/10 @ 632.8nm |
Wavefront distortion | λ/8@ 632.8nm |
Surface quality | 10/5 per MIL-O-13830A |
Parallelism | 20″ |
Perpendicularity | 5′ |
Clear Aperture: | > 90% |
Chamfer: | < 0.1 mm @ 45° |
Size | Upon customer request |
Coating | AR/PR coating upon customer’s request |
Damage Threshold | 750MW/CM2 at 1064nm, TEM00, 10ns, 10Hz |
Quality Warranty Period | One year under proper use |
Optical and Nonlinear properties of BBO crystal
Transparency Range | 190-3500nm |
SHG Phase Matchable Range | 409.6-3500nm (Type I) 525-3500nm (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(at 1064nm) <1%/cm(at 532nm) |
Angle Acceptance | 0.8mrad·cm (θ, Type I, 1064 SHG) |
1.27mrad·cm (θ, Type II, 1064 SHG) | |
Temperature Acceptance | 55℃·cm |
Spectral Acceptance | 1.1nm·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 | |
Non-vanished NLO susceptibilities | d11 = 5.8 x d36(KDP) |
d31 = 0.05 x d11 | |
d22 < 0.05 x d11 | |
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 (at 1064 nm,3x3x20mm3) |
Resistivity | >1011 ohm·cm |
Relative Dielectric Constant | εs11 / εo : 6.7 |
εs33 / εo : 8.1 | |
Tanδ<0.001< span=""> |
Physical properties of BBO crystal
Crystal Structure | Trigonal，Space Group R3c |
Lattice Parameter | a=b=12.532Å,c=12.717Å,Z=6 |
Melting Point | About 1095℃ |
Mohs Hardness | 4 |
Density | 3.85 g/cm3 |
Refractive indices | no = 1,6551; ne = 1,5426 |
Thermal Conductivity | ⊥c: 1.2W/m/K; //c: 1.6W/m/K |
Thermal Expansion Coefficients | α11=4 x 10-6/K; α33=36x 10-6/K |
