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Pushing the boundaries of high power lasers: low loss, large area CVD diamond
Author(s): Benjamin Wickham; Frank Schoofs; Stefan Olsson-Robbie ; Andrew Bennett; Richard Balmer
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Paper Abstract

Synthetic CVD diamond has exceptional properties, including broad spectral transmission, physical and chemical robustness, and the highest thermal conductivity of any known material, making diamond an attractive material for medium to high power optical and laser applications, minimizing the detrimental effects of thermal lensing and radiation damage. Example applications include ATR prisms, Raman laser crystals, extra- and intra-cavity laser cooling. In each case the demands on the fundamental material properties and fabrication routes are slightly different. In recent years, there has been good progress in the development of low-loss, single crystal diamond, suitable for higher power densities, higher pulse rates and more demanding intra- and extra-cavity thermal management. The adoption of single crystal diamond in this area has however, been hindered by the availability of large area, low birefringence plates.

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.

Paper Details

Date Published: 20 February 2018
PDF: 9 pages
Proc. SPIE 10513, Components and Packaging for Laser Systems IV, 1051306 (20 February 2018); doi: 10.1117/12.2289964
Show Author Affiliations
Benjamin Wickham, Element Six Ltd. (United Kingdom)
Frank Schoofs, Element Six Ltd. (United Kingdom)
Stefan Olsson-Robbie , Element Six Ltd. (United Kingdom)
Andrew Bennett, Element Six Ltd. (United Kingdom)
Richard Balmer, Element Six Ltd. (United Kingdom)


Published in SPIE Proceedings Vol. 10513:
Components and Packaging for Laser Systems IV
Alexei L. Glebov; Paul O. Leisher, Editor(s)

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