Abstract: The high temperature phase barium metaborate α-BaB₂O₄ single crystal with 25mm in diameter, 100mm in height was grown by the Bridgman method. The data of crystal growth was briefly introduced. The results show that there is not any scattering particle examined under He-Ne laser in the crystal. And the birefractive index of this crystal in visible spectra is about △n≈0.13. The transmittance of the crystal obtained in 200～900nm is more than 80%.

Key words: α-BaB₂O₄, Bridgman method, birefringent crystal