Germanium has a very high refractive index making it essential to add anti-reflection coatings to improve its transmission. Germanium is a great choice for Infrared applications due to its mechanically rugged background. The transmission of Germanium is very sensitive to temperature and above 70°C becomes opaque.
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A4566-1-CF | Germanium (Ge) Viewport, UHV Rated Vacuum-Optics, 0.90″ View Dia, 2.75″ Conflat Flange
A4966-1-CF | Germanium (Ge) Viewport, UHV Rated Vacuum-Optics, 1.88″ View Dia, 4.50″ Conflat Flange
– Captain Jean-Luc Picard
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