This is a 38.1 mm diameter Germanium Flat Window, offered by Alkor Technologies. The window, which has a thickness of 3mm, is uncoated, making it suitable for a wide range of applications where specific coating requirements are not necessary.
The Germanium material used in this window is identified as "germanium burnett". This material is known for its excellent transmission properties, particularly in the infrared region of the spectrum, with a wavelength of 10600 nm. This makes the window ideal for use in infrared optical systems.
The window is of the "Thin Lens" shape, which means it has a flat surface on both sides. This shape is often used in applications where the optical path needs to be as straight as possible, such as in beam delivery systems or in systems where the window is used as a protective barrier.
For more information about this product, including its availability and pricing, please refer to the vendor's website at http://www.alkor.net/germanium_windows_catalog.html.