BBO
Description:
Beta-Barium Borate (β-BaB2O4, BBO), is a nonlinear optical crystal with combination of number of unique features.
Features:
Broad phase matchable range from 410 nm to 3500 nm;
Wide transmission region from 190 nm to 3500 nm;
Large effective second-harmonic-generation (SHG) coefficient about 6 times greater than that of KDP crystal;
High damage threshold of 10 GW/cm2 for 100ps pulse-width at 1064nm;
High optical homogeneity with dn ~10-6/cm;
Wide temperature-bandwidth of about 55°C.
Applications:
Second, third, fourth and fifth harmonic generation of Nd doping lasers;
Second harmonic generation to generate wavelengths as short as 204.8 nm;
Shorter wavelengths (193nm) can be generated by sum frequency mixing;
Frequency doubling, tripling and -mixing of Dye lasers;
Second, third and fourth harmonic generation of Ti:Sapphire lasers;
Optical parametric amplifier (OPA) and optical parametric oscillators (OPO);
Frequency-doubling of Argon ion, Cu-vapor and Ruby lasers;
Transverse field Pockel cells made from BBO useful when high average powers or short wavelengths used.
Physical and Chemical Properties:
| Crystal Structure | Trigonal, space group R3c |
| Cell Parameters | a=b=12.532Å, c =12.717Å, Z=6 |
| Melting point | 1095°C |
| Mohs hardness | 4 |
| Density (gram/cm3) | 3.85 |
| Hygroscopic Susceptibility | low |
| Thermal Conductivity (W/m/K) | ⊥c: 1.2, ║c: 1.6 |
| Thermal Expansion Coefficients (K-1) | α11= 4 x 10-6, α33= 36 x 10-6 |
| Resistivity (ohm • cm) | > 1011 |
| Relative Dielectric Constant | εs11/ε0= 6.7, εs33/ε0= 8.1 |
Optical and Nonlinear Properties:
| Transparency Range | 190-3500 nm |
| Phase Matching Range | 409.6-3500nm |
| Electro-Optics Coefficients (pm/V) | γ22= 2.7 |
| Thermo-Optic Coefficients (°C-1) | dno/dT= -16.6 x 10-6, dne/dT = -9.3 x 10-6 |
Specifications:
| Apertures | Up to 20x20mm2 |
| Length | Up to 25mm |
| Dimension Tolerance | (W±0.1mm) x ( H±0.1mm) x (L+0.2mm/-0.1mm) |
| Phase Matching Angle Tolerance | Δθ< 0.25o, Δφ< 0.25o |
| Flatness | λ/10 @ 633nm |
| Transmitted Wavefront Distortion | < λ/8 @ 633nm |
| Surface Quality | 10/5 scratch/dig |
| Parallelism | < 20 arc seconds |
| Perpendicularity | < 5 arc minutes |
| Clear Aperture | 90% central area |
| Edge Bevel | 0.15mm x 45°±5°chamfer |
| AR Coatings | R < 0.2% @ 1064nm, R < 0.5% @ 532nm |
| Guaranteed Damage Threshold of AR Coating | 500 MW/cm2for 1064nm, 10ns pulse, 10Hz |