The 84-457 is a 40 mm diameter, 4 mm thick flat window made from UVFS material, specifically UVFS Mal-1965. This window is designed for use in the visible to near-infrared (VIS-NIR) spectrum, spanning 400-1000nm.
The window features a coating on both the front and back surfaces, specifically the EDM VISNIR0SP2002000 coating. This coating is designed to optimize performance in the VIS-NIR spectrum, providing excellent transmission characteristics and durability.
The window is shaped as a thin lens, making it suitable for use in a wide range of optical systems where minimal thickness and weight are desirable. The circular geometry of the window allows for easy integration into circular optical paths.
This window is available from Edmund Optics and is currently in stock, according to the vendor's website. The provided weblink provides direct access to the product page for further information and purchasing.