| Chemical Formula | a-Ba2B2O4 |
| Crystal Symmetry | uniaxial negative |
| Optical Symmetry | |
| Class |
 |
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The refractive index and birefringence are similar to that of b-BBO
Birefringence of a-BBO Measured @ 22.5°C
Wavelength
no
ne
Birefringence
0.5461mm
1.6567
1.5342
0.1226
0.5780mm
1.6543
1.5325
0.1219
0.6328mm
1.6507
1.5301
0.1206
Because of its good transmission in the ultraviolet, uv polarizers made from a-BBO have attractive features.
Shown below is the transmission of an uncoated Rochon polarizer with a total crystal path length of 12 mm.
Several types of prism polarizers can be made from a-BBO.
Glan-Laser polarizers have a fairly narrow wavelength range of application due to the dispersion of the refractive index.
At shorter wavelengths, the e-ray, which is normally transmitted, has a tendency to undergo total internal reflection.
Rochon polarizers can be made for applications in which the angular field-of-view is limited.
See the above transmission curve. A typical field-of-view for a Rochon polarizer made from a-BBO is 10 arcminutes.
INRAD typically manufactures the Glan-Thompson type polarizer with the following properties.
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| f | Size (mm) | Wavelength Range | Transmission | Extinction | Field-of- View | Beam Deviation | Scratch-Dig |
| 13 mm | 13 x 13 x 25.5 | 230 nm — 800 nm | > 80% at all wavelengths | > 1000:1 at all wavelengths |
+/- 2° | < 5 arcmin. | < 40-20 |
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