The WG71050-E4 is a precision window from Thorlabs, designed with a 1-inch diameter and a thickness of 5 mm. This flat window is made of ZnSe material, specifically marple-1964, and is coated with a broadband anti-reflective coating (AR) on both the front and back surfaces. The coating, identified as tho e4znsearc2000130, is designed to operate within the wavelength range of 2-13 µm, making it suitable for a wide range of optical applications. The window features a thin lens shape and has a circular base shape. The catalog number for this item is WG71050-E4, and it is currently in stock. For more information, users can visit the vendor's website through the provided weblink, which has been verified as valid.