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α-BBO Crystal  
High temperature phase of BaB2O4 is an excellent birefringent crystal, it is characterized by large birefringent coefficient and wide transmission window from 189nm to 3.5mm, particularly it’s suitable to make UV polarizer for high power application.
 
The physical, chemical, thermal and optical properties of a-BBO crystals are similar to those of b-BBO, for instant high optical homogeneity, extremely low absorption in UV to IR range, low hygroscopic susceptibility, high damage threshold.
a-BBO physical properties are similar to BBO.
 
 

Basic Properties of a-BBO

Transparency Range:
189 - 3500 nm, See Transparency Curve
Transparency Curve of a-BBO
Density: 3.85 g/cm3
Therm-Optic Coefficients:
dno/dT = -9.3 x 10-6/oC
dne/dT = -16.6 x 10-6/oC
Damage Threshold
at 1064 nm           1GW/cm2
at 355 nm            500 MW/cm2
Optical Homogeneity:Dn » 10-6/cm
Mohs Hardness: 4.5
Hygroscopic Susceptibility:Low
Thermal Expansion Coefficients
(in the range of 25oC – 900oC)
aa= 4 x 10-6/K
ac= 36 x 10-6/K
Linear Absorption Coefficients: a <0.005 cm-1 from 300 nm to 2300 nm
Refractive Indices, Birefringence (Dn = ne - no) and Walk-off Angle at 45o (r):
at 1.0642 mm ne= 1.5379, no = 1.6579      Dn =-0.073282 r =-4.9532°
at 0.5321 mm ne = 1.5534, no = 1.6776      Dn =-0.075491  r =-5.0407°
at 0.2660 mm ne = 1.6114, no = 1.7617 Dn=-0.089805 r =-5.6926°

 
Specifications:
Dimension tolerance
±0.1mm
Angle tolerance
<0.5°
Surface flatness
l/8@632.8nm
Wavefront distortion
l/8@632.8nm
Surface quality
20-10
Parallelism
<20 arcsec
Perpendicularity
<5 arcmin
Clear aperture
>80%

 

   
 

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