89-562 20 mm Dia. Germanium Protective Flat Window; t=2 mm BBAR 3-5µm

The 89-562 is a 20 mm diameter Germanium Flat Window with a thickness of 2 mm, designed for use in optical systems. This component is sourced from Edmund Optics, a reputable vendor known for their high-quality optical elements. The window features a BBAR (Broadband Anti-Reflection) coating with a 3-5 µm wavelength, enhancing its performance in a wide range of applications.

The Germanium material used in this window is identified as "germanium burnett". Germanium is a popular choice in optical systems due to its high refractive index and transparency in the infrared region of the spectrum. This makes the 89-562 particularly suitable for applications that involve infrared light.

The window's geometry is defined by its 20 mm diameter and 2 mm thickness. This thin, circular shape allows for easy integration into various optical systems. The window's flat design ensures minimal distortion of the light passing through it, making it ideal for applications that require high optical precision.

The BBAR coating on both the front and back surfaces of the window is designed to reduce reflection and increase transmission of light. This coating is specifically tuned for a wavelength of 4000 nm, making it effective in the infrared region of the spectrum.