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.