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Crystals Birefringent Crystals a-BBO

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.Claser 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.


1. Basic Properties of a -BBO

Please view Birefringent Physical Properties (PDF Format)

Sellmeier equations: (l in mm) :
no2=2.7359+0.01878/(l2-0.01822)-0.01354l2
ne2=2.3753+0.01224/(l2-0.01667)-0.01516l2

Refractive Indices, Birefringence ( D n = n e - n o ) and Walk-off Angle at 45 o ( r ):
at 1.0642 m m n e = 1.5379, n o = 1.6579 Dn =-0.073282 r = -4.9532°
at 0.5321 m m n e = 1.5534, n o = 1.6776 Dn =-0.075491 r = -5.0407°
at 0.2660 m m n e = 1.6114, n o = 1.7617 Dn=-0. 089805 r = -5.6926°
Applications of a -BBO

Please refer to Polarizer for the applications of a-BBO

Specifications of a -BBO

Surface Quality

20/10 Scratch and Dig

Beam Deviation

<3 arc min.

Optical Axis Orientation

+/-0.5°

Flatness

l /4 @ 632.8 nm

Transmission Wavefront Distortion

< l /2 @632.8 nm

AR-coating

R<0.5%


 

 
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