Large single crystals Of Y0.57La0.72SC2.71(BO3)(4) have been grown by a top-seeded high-temperature solution method. The high-energy optical absorption edge for polished pieces was found to be at a wavelength of 190 nm. Sellmeier equations for the dispersion in the refractive indices were determined on the basis of curve fitting of data obtained by the method of minimum deviation. From modeling and optical measurements on powders, the nonlinear optical coefficient all I has been determined to be 1.35 pm/V. (c) 2006 Elsevier B.V. All rights reserved.