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Alpha BBO
High temperature form BBO(α-BBO) has large birefringence from 189nm to 3500nm. It is an excellent crystal to replace calcite, TiO 2 and LiNbO 3 etc. in polarizers as well as walk-off beam splitters, especially for high power and UV polarizer, due to its unique UV transparency good mechanical properties and high damage threshold. It has an abvious advantage on homogeneity over natural calcite in UV application. The nonlinear optical properties of α-BBO is vanished due to the centric symmetry with its crystal structure. Basic Properties:
Transparency Range:
189 - 3500 nm
Mohs Hardness:
4.5
Optical Homogeneity:
Δn≈ 1 0-6 /cm
Hygroscopic Susceptibility:
Low
Damage Threshold:
1GW/cm2 at 1064 nm 500 MW/cm2 at 355 nm
Linear Absorption Coefficients:
a <0.005 cm -1 from 300 nm to 2300 nm
Refractive Indices, Birefringence
( Δn = ne - no ) and Walk-off Angle at 45°( r ):
1.064mm ne=1.5379, no=1.6579 Δn=-0.073282 r=-4.9532°
0.532mm ne=1.5534, no=1.6776 Δn=-0.075491 r=-5.0407° 0.266mm ne=1.6114, no=1.7617 Δn=-0.089805 r=-5.6926° Main Specifications:
Surface Quality:
20/10 Scratch and Dig
Beam Deviation:
<2 arc min
o and e Beam Angle:
<30 arc secondes
Orientation:
±0.5°
Flatness:
λ/4 @ 632.8 nm
Transmission Wavefront Distortion:
<λ/2 @632.8 nm
AR-coating:
R<0.5%
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