To address this, we report a combination of CVD growth and processing methods that have enabled the manufacture of large, low defect substrates. A final homoepitaxial, low absorption synthesis stage has produced plates with large area (up to 16 mm edge length), low absorption (α<0.005 cm-1 at 1064 nm), and low birefringence (∆n <10-5), suitable for double-sided intra-cavity cooling. We demonstrate the practical advances in synthesis, including increasing the size while reducing in-use losses compared to previous generations of single crystal material, and practical developments in processing and implementation of the single crystal diamond parts, optimizing them for use in a state-of-the-art femto-second pulsed Ti:Sa thin disk gain module, all made in collaboration with the wider European FP7 funded Ti:Sa TD consortium.
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Benjamin Wickham, Frank Schoofs, Stefan Olsson-Robbie , Andrew Bennett, Richard Balmer, "Pushing the boundaries of high power lasers: low loss, large area CVD diamond," Proc. SPIE 10513, Components and Packaging for Laser Systems IV, 1051306 (20 February 2018);