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Optical constants of 6H-SiC have been measured by using far infrared (FIR) lasers of 48, 57, 71, and 119 μm in wavelength. The refractive index and absorption coefficient at the wavelength have been determined from the transmittance of a rotating SiC etalon. For the application of the SiC to optical elements in the FIR region, it was compared with other materials (crystal quartz, high resistive silicon,...
A diagnostic system using short-wavelength far-infrared (FIR) lasers (40–70 μm in wavelength) is now being developed for high density and large volume plasmas. In the wavelength region, a CVD-diamond is the excellent materials for optical windows of the laser and the plasma vessel and beam splitters of a multichannel interferometer. To design these optical elements, the optical constants (refractive...
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