The MF-W-50.8x3 is a flat window type optical element, sourced from Alkor Technologies, with a diameter of 50.8 mm and a thickness of 3 mm. This window is designed in a circular base shape, following the 'Thin Lens' geometry.
The material used in this window is Magnesium Fluoride (MgF2), identified as 'magnes dod-1984-n-o' in the Material ID. This material is known for its excellent transparency in the ultraviolet, visible, and near-infrared regions of the spectrum. The window is uncoated, meaning it does not have any additional layers of material applied to alter its optical properties.
The wavelength for this window is 633 nm, which is in the visible light spectrum. This specific wavelength is often used in optical systems for reference or alignment purposes.
Please note that the link provided (http://www.alkor.net/MgF2_windows.html) is valid and indicates that the window is in stock, ready for immediate use in your optical system.