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β Barium borate (β-BaB2O4, β-BBO) combines many outstanding features, such as its high nonlinear optical coefficient, low group velocity dispersion, wide transparency range (1893500 nm), and high damage threshold. This unique combination ensures that β -BBO crystals become promising candidates for a variety of nonlinear optical applications (e. g., frequency converters and optical parametric oscillators).
Product Description
In the field of quantum optics, β-BBO crystals can be used to generate entangled photon pairs and ten-photon entanglement. BBO nonlinear crystal is a negative uniaxial crystal that can provide phase matching through various second-order interactions throughout its transparent range (from 185 nm to 3.3 µ m, based on transmittance measurements using crystal samples several millimeters thick), making it a widely used crystal for nonlinear frequency conversion in ultraviolet, visible, and near-infrared. In this regard, the BBO crystals are the most important nonlinear crystals used for the near-infrared light parameter pulse pulse amplifier. Currently, it provides only very few optical cycle pulses with high average power and ultra-high peak power.
Main Features
Wide band range for phase matching (409.6-3500nm)
Wide penetration band range (190-3500nm)
High frequency conversion efficiency (equivalent to 6 times that of KDP crystal)
Good optical uniformity (δn≈10-6/cm）
High damage threshold (10GW/cm2 @ 1064nm with 100ps pulse width）
Temperature receiving angle width (around 55℃)
Typical Applications
Nd: YAG and Nd: the two, three, four, and five times the frequency of the YLF laser
Double frequency, triple frequency and mixing of the dye laser
Ti: two, three and four times the frequency of Sapphire and Alexandrite lasers
Optical Parametric amplifier (OPA) and optical Parametric oscillator (OPO)
Argon ions, ruby and Cu vapor lasers
In the research and development field of high, precision, and sharp laser technologies such as all solid-state tunable lasers, ultra fast pulse lasers, and deep ultraviolet lasers.
Characteristic of Materials
| Crystal structure | Tripartite crystal system, space group R3c |
| Crystal lattice parameters | a=b=12.532Å, c=12.717Å, Z=6 |
| Melting point | About 1095℃ |
| Transformation point | 925±5℃ |
| Optical homogeneity | δn≈10-6/cm |
| Mohs (Mohs) hardness | 4 |
| Density | 3.85 g/cm3 |
| Absorbance index | ＜0.1%/cm(at 1064nm) |
| Specific heat | 1.91J/cm3xK |
| Hygroscopy | low |
| Thermal expansion coefficient | α11=4 x 10-6/K; α33=36x 10-6/K |
| Heat conductivity | 1.2W/m/K（⊥c）; 1.6W/m/K（∥c） |
Properties
| Phase matching output wavelength | 190-1750nm |
| Nonlinear optical coefficient | d11=5.8 x d36(KDP)d31=0.05 x d11d22<0.05 x d11 |
| Photoelectric coefficient | γ22=2.7 pm/V |
| Half-wave voltage | 7KV (@1064 nm,3x3x20mm) |
| Damage threshold@1064nm@ 532nm | 0.5GW/cm2(10ns, 10HZ, AR-coated)0.3GW/cm2(10ns, 10HZ, AR-coated) |
Product Parameter
| Wavefront distortion | ≦λ/8 @ 633nm |
| Dimension tolerance | (W±0.1mm)x(H±0.1mm)x(L+0.5mm/-0.1mm)（L≥2.5mm）(W±0.1mm)x(H±0.1mm)x(L+0.1mm/-0.1mm)（L＜2.5mm） |
| Optical aperture | ≧90% |
| Flatness | λ/8 @ 633nm |
| Finish | 10/5 |
| Depth of parallelism | ≦20" |
| Verticality | ≦5 ′ |
| Angular deviation | △θ≦0.25°,△φ≦0.25° |
