BBO is featured by
● Broad phase matchable range from 409.6 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;
● High optical homogeneity with dn » 10-6/cm;
● Wide temperature-bandwidth of about 55°C.
Basic Properites of BBO
Table 1.Chemical and Structural properties of BBO
Crystal Structure: | Trigonal, space group R3c |
Lattics Parameters: | a=b=12.532Å, c=12.717Å, Z=6 |
Melting point | About 1095℃ |
Mohs Hardness | 4 |
Density | 3.85g/cm3 |
Thermal Conductivity | 1.2W/m/K(┴c): 1.6W/m/K(//c) |
Thermal Expansion Coefficients | a11=4x10-6/K; a33=36x10-6/K |
Table 2.Optical and Nontinear Optical Properties Of BBO
Transparency Range: | 190-3500nm |
SHG Phase Matchable Range | 409.6-3500nm(Type I) 525-3500nm(Type II) |
therm-optic Coefficients(/℃) | dno/dT=-16.6X10-6 dne/dT=-9.3X10-6 |
Absorption Coefficients | <0.1%/cm at 1064nm <1%/cm at 532nm |
Angle Acceptance | 0.8mrad-cm (θ, Type I,1064 SHG) |
Temperature Acceptance | 55℃-cm |
Spectral Acceptance | 1.1nm-cm |
Walk-off Angle | 2.7° (Type I 1064 SHG) |
NLO Coefficients | deff (I)=d31sinθ+(d11cosΦ-d22sin3Φ)cosθ |
Non-vanished NLO susceptibilities | d11=5.8xd36(KDP) |
sellmeier Equations(λ in μm ) | no2=2.7359+0.01878 / (λ2-0.01822) -0.01354 λ2 |
Electro-optic coefficients: | r22=2.7pm/V |
Half-wave voltage: | 7KV (at 1064nm,3*3*20mm3) |
Resistivity: | >1011 ohm-cm |
Relative Dielectric Constant: | εs11/εo:6.7 |
Coatings of BBO
● Dual Band AR-coating (DBAR)of BBO for SHG of 1064nm
low reflectance (R<0.2% at 1064nm and R<0.5% at 532nm);
high damage threshold (>300MW/cm2 at both wqvelengths);
long durability;
● Broad Band AR-coating (BBAR) of BBO for SHG of tunable lasers.
● Broad Band P-coating of BBO for OPO applications.
Note: Other coatings are available upon request.
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