- 4H 6H VANADIUM-COMPENSATED 4H AND 6H SINGLE CRYSTALS OF OPTICAL GRADE AND SILICON CARBIDE CRYSTALS AND METHODS FOR PRODUCING SAME

摘要

The optical device comprises a vanadium compensated, high resistivity 6H or 4H polytype SiC single crystal to transmit light having a wavelength in the range of 420 nm to 4.5 μm. The device may include a window, lens, prism, or waveguide. The system comprises a light source for generating light having a wavelength in the range of 420 nm to 4.5 μm and a device for receiving and transmitting light, wherein the device comprises a vanadium compensated, high resistivity 6H or 4H polytype SiC contains single crystals. The present invention also relates to a method for crystallization and optical applications, comprising an aluminum doped SiC crystal with residual nitrogen and boron impurities, wherein the aluminum concentration is greater than the combined concentration of nitrogen and boron and the light absorption coefficient is less than about 0.4 cm −1 at wavelengths between about 400 nm and about 800 nm.