Fused Silica Optics Co.,LTD
Fused Silica Optics Co.,Ltd
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BBO Nonlinear Optical Crystal for Frequency Doubling
BBO(beta-BaB2O4 ) is grown with the flux method. It is a negative uniaxial crystal, with ordinary refractive-index larger than extraordinary refractive-index. Also, it is a nonlinear optical crystal with combination of number of unique features. Wide transparency and phase matching ranges, large nonlinear coefficient, high damage threshold and excellent optical homogeneity provide attractive possibilities for various nonlinear optical applications. BBO has the following exceptional properties that make it a very important nonlinear crystal:
Useful optical transmission from 190 nm to 3500 nm
Broad phase-matching range from 410 nm to 2100 nm
Large effective second-harmonic-generation (SHG) coefficient about 6 times greater than that of KDP crystal
High damage threshold of 10GW/cm2 for 100ps pulse-width at 1064nm
Low thermo-optic coefficient
Specifications
| Dimension Tolerance | (W±0.1mm)x(H±0.1mm)x(L+0.5/-0.1mm) |
| Angle Tolerance | △θ< 0.25°,△Φ < 0.25° |
| Clear Aperture | central 95% of the diameter |
| Surface Flatness | <λ/10 at 633nm |
| Wavefront Distortion | <λ/8 @ 633nm |
| Chamfer | 0.1mm@45 |
| Surface Quality | 10/5 |
| Parallelism | < 20 arc seconds |
| Perpendicularity | < 5 arc minutes |
| Coatings: | Protective (P) and Anti-reflection (AR) coating available upon customer’s requests |
| Damage threshold | >1 GW/cmfor1064nm,TEM00,10ns,10HZ(polished only) |
| >0.5 GW/cm2for 1064nm,TEM00,10ns,10HZ(AR-coated) | |
| >0.3 GW/cm2 for 532nm,TEM00,10ns,10HZ(AR-coatd) |
Chemical and Structural properties
| Crystal Structure | Trigonal, space group R3c |
| Lattics Parameters | a=b=12.532, c=12.717 , Z=6 |
| Melting point | About 1095°C |
| Mohs Hardness | 4 |
| Density | 3.85g/cm3 |
| Thermal Conductivity | 1.2W/m/K(┴c): 1.6w/m/K(||c) |
| Thermal Expansion Coefficients | α,4x10-6/K; c,36x10-6/K |
Optical and Nonlinear Optical Properties
| Transparency Range | 190-3500nm |
| SHG Phase Matchable Range | 409.6-3500nm(Type I) 525-3500nm(Type II) |
| therm-optic Coefficients(/°C) | dno/dT=-9.3x 10-6/°C dne/dT=-16.6x 10-6/°C |
| 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°C-cm |
| Walk-off Angle | 1.1nm-cm |
| Walk-off Angle | 2.7°(Type I 1064 SHG) 3.2° (Type II 1064 SHG) |
| NLO Coefficients | deff(I)=d31sinθ+(d11cosΦ-d22sin3Φ)cosθ deff(II)=(d11sin3Φ+d22cos3Φ)cos2θ |
| Non-vanished NLO susceptibilities | d11=5.8xd36(KDP) d31=0.05xd11 d22<0.05xd11 |
| sellmeier Equations(λ in μm ) | no2=2.7359+0.01878 / (λ2-0.01822) -0.01354 λ2 ne2=2.3753+0.01224 / (λ2-0.01667) -0.01516 λ2 |
| Electro-optic coefficients | r11=2.7pm/V, r22, r31<0.1γ11 |
| Half-wave voltage | 48Kv(at 1064nm) |
| Resistivity | >1011 ohm-cm |
| Relative Dielectric Constant | εs11/εo:6.7 εs33/εo:8.1 Tan δ<0.001 |