Ge Windows and Lens

Zoolied Lwir Ge Windows can be acted as a longpass filter for wavelengths greater than 2 µm. In addition, germanium is inert to air, water, alkalis, and many acids. Due to its broad transmission range and opacity in the visible portion of the spectrum, a Single Crystal Ir Germanium is well suited for IR laser applications. Germanium's transmission properties are highly temperature sensitive; germanium windows and lenses are highly sensitive to temperatures above 70°C when it will become opaque, in fact, the absorption becomes so large that germanium is nearly opaque at 100 °C and completely non-transmissive at 200 °C.
Zoolied Germanium With Dlc Coating or other COATING is available off-the-shelf with three anti-reflection coating options: 3 - 5μm for mid-infrared applications, 3 - 12μm for broadband multispectral applications, or 8 - 12μm for thermal imaging applications. Due to its high index of refraction (around 4.0 from 2 - 14μm), an anti-reflection coating is recommended on these Germanium windows for sufficient transmission in the region of interest. Germanium is subject to thermal runaway, meaning that the transmission decreases as temperature increases. As such, these Germanium windows should be used at temperatures below 100°C. Germanium’s high density (5.33 g/cm3) should be considered when designing for weight-sensitive systems. The Knoop Hardness of Germanium (780) is approximately twice that of magnesiμm fluoride, making it ideal for infrared applications requiring rugged optics.
Zoolied Optical Windows are offered in a variety of substrates, such as Dlc Coating Silicon Windows, N-BK7(H-K9L), Ir Znse Windows, and Caf2 Windows. Multiple anti-reflection coating options are available for the Ultraviolet (UV), visible, or Infrared (IR).

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