Abstract
Single crystals of calcium fluoroborate, Ca5(BO3)3F (CBF), have been grown by the flux method with various proportions of LiF. This compound was investigated for nonlinear optical applications and was expected to exhibit an extended transparency window in the ultraviolet. The growth cracking and inclusions in the as-grown crystal boule are discussed. CBF crystallizes in the noncentrosymmetric space group Cm (Z = 2) with a = 8.134(3) A, b = 16.062(5) A, c = 3.5422(9) A and β = 100.88(2)°. The structure is built from [BO3]3− anionic groups and is closely related to the one of calcium oxoborates like YCa4O(BO3)3 (YCOB). The UV absorption edge was measured and compared with the one of YCOB. The refractive indices were measured by the minimum deviation technique and fitted to the Sellmeier equations. The noncritical phase matching (NCPM) wavelengths for harmonic generation are reported.
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