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FTDiam Inc. (New York, USA) is an advanced materials manufacturer that uses its proprietary AHPHT technology to produce ultra-high purity single crystal diamond substrates. We provide high-quality Type IIa diamonds up to 15 x 15 mm for cutting-edge fields such as quantum devices for NV centers, laser and X-ray optics, and thermal diffusion of semiconductors. They boast excellent crystal quality with a dislocation density of less than 10¹ cm⁻² and boron and nitrogen concentrations at the ppb level.