a-BBO, high temperature phase of BaB2O4, is an excellent birefringent crystal
High Temperature form BBO ( a -BaB 2 O 4 ) is a negative uniaxial crystal. It has large birefringence over the broad transparent range from 189 nm to 3500 nm. The physical, chemical, thermal and optical properties of a-BBO crystal are similar to those of b-BBO. However, the nonlinear optical properties of a-BBO crystal is vanished due to the centric symmetry with its crystal structure. It is not recommended to use for NLO processes.
a -BBO is an excellent crystal to replace Calcite, TiO 2 , and LiNbO 3 , etc. in Glan-Taylor and Glan-Thompson 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. A-Star manufactures and supplies Glan-Laser, Glan-Taylor, Glan-Thompson Polarizers and other beam displacers from high quality a -BBO crystals to replace Calcite in many applications, especially in UV and high power operations.
BBO Crystal Specifications:
Dimension tolerance: (W 0.1mm) x (H 0.1mm) x (L + 0.2mm/-0.1mm)
Wavefront distortion: less than λ /8 @ 633nm
Flatness: λ /8 @ 633nm
Surface Quality: 10/5 to MIL-O-13830A
Parallelism: < 20 arc seconds
Perpendicularity: 5 arc minutes
Angle tolerance: < 0.5, < 0.5
Coating: AR/AR on both sides for single wavelength or dual-wavelength, R<0.2%
Protective coating (P-coating) for high damage and wide wavelength range
Size: as large as 20 x 20 mm and as thin as 0.02mm
Mounting: it will be mounted when thickness less than 2 mm. (Free!)
Quality Warranty Period: one year under proper use
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