High Temperature form BBO (a-BaB2O4) is a negative uniaxial crystal.It has large birefringence over the broad transparent range from 189 nm to 3500 nm.Recently,MT-Optics has succeeded in growing this crystal into large size.The physical,chemical,thermal and optical properties of a-BBO crystal are similar to those of β-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 or NLO processes.
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