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Used as a prism and window for wavelengths from the vacuum ultraviolet region of 115.0mm to the infrared region of 9.5 .
It is most suitable material as window for ArF Eximer Laser, because it has the wide band-gap.
It is also effective as a polarizing element in the ultraviolet region.
Also, the crystal fine grain is appropriate as a vacuum evaporation material.
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