Offered Uncoated or with AR Coating for 1.9 - 6 µm or 7 - 12 µm Germanium(Ge) Windows, Infrared Windows φ5-100mm

Offered Uncoated or with AR Coating for 1.9 - 6 µm or 7 - 12 µm Germanium(Ge) Windows, Infrared Windows φ5-100mm

Precision Germanium (Ge) Windows are offered in Ø1/2" and Ø1" sizes. They are available uncoated or with an AR coating on both sides that provides <2% average reflectance from 1.9 to 6 µm (offered in Ø1" size only) or <1% average reflectance from 7 to 12 µm. See the graphs in the tables below for the transmission of our uncoated and AR-coated germanium windows in the IR spectral range, or refer to the Graphs tab for data extending down into the visible range.

Due to its broad transmission range and opacity in the visible portion of the spectrum, germanium is well suited for IR laser applications. As indicated by the plots in the Graphs tab, germanium also acts as a longpass filter for wavelengths greater than 2 µm. In addition, germanium is inert to air, water, alkalis, and many acids. Germanium's transmission properties are highly temperature sensitive; in fact, the absorption becomes so large that germanium is nearly opaque at 100 °C and completely non-transmissive at 200 °C.

Attention

offers flat windows fabricated from N-BK7, UV Fused Silica, Sapphire, Calcium Fluoride, Magnesium Fluoride, Potassium Bromide, Infrasil, Zinc Selenide, Silicon, Germanium, or Barium Fluoride. Our laser windows have a wavelength-specific AR coating centered around commonly used laser wavelengths and an optional wedge, while our precision windows are offered with or without a broadband AR coating. For more information on these substrates,

Map Optics Technology provides a variety of flat Windows with no coating and anti-reflection coating substrates.

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