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Not Available Borates have an intrinsic band edge below 200 nm, which makes them attractive for optical applications in the deep UV. The birefringence of beta-BaB204 (BBO) is large enough to allow phase matching down to the band edge, so crystal growth and processing innovations that improve transmission and the damage threshold in the UV can have a beneficial effect on harmonic generation. This project focuses on the preparation of starting materials for BBO crystal growth, crystal growth of BBO using the Czochralski technique to avoid the alpha/beta phase transition, and post growth to improve optical properties of the crystals. The successful completion of a Phase I effort should demonstrate the feasibility of rapid growth of BBO crystals combined with post-growth processing that leads to potentially lower extrinsic losses than in solution-grown crystals. The damage resistance of crystals processed using these techniques is also expected to be higher than in solution-grown crystals