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α-BBO
Advantages of α-BBO：
• High UV transmittance
• Large birefringence
• High damage threshold
• Stable physical and mechanical properties
Table 1. Basic Properties of α-BBO
|
Transparency Range |
190-3500nm |
|
Density |
3.85g/cm3 |
|
Hygroscopic Susceptibility |
Low |
|
Hardness (Mohs) |
4.5 |
|
Thermal Expansion Coefficients（/℃） |
9.3×10-6（C） 9.5×10-6（A） |
|
Damage Threshold |
1GW |
|
Refractive Indices |
no=1.6776，ne=1.5534，at 532nm no=1.6579，ne=1.5379，at 1064nm |
|
Sellmeier Equation（λ in μm） |
no2=2.7471+0.01878/(λ2-0.01822)-0.01354λ2 |
Table 2. Specifications of α-BBO
|
Size |
1mm-40mm |
|
Surface Quality |
10/5 |
|
Optical Axis Orientation |
6′ |
|
Parallelism |
＜10″ |
|
Flatness |
λ/4 @ 633nm |
|
Clear Aperture |
＞90% |
|
Coating |
AR-coating |
|
Mount |
Upon Customer’s Specification |
Figure 1. Transparency Curve
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