Abstract
One of the main difficulties in growing single crystal materials for use as lasers is the control of removal of defects which act as light scattering centres. This is particularly true in the growth of calcium tungstate single crystals, where many such defects are reported. 1–3 In this note, a method of removing metallic scattering centres is described together with the identification and removal of a non-metallic impurity which also causes optical scattering. These two topics are discussed separately.
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