The 11-900 is a 25 mm diameter, 1 mm thick flat window made from UVFS material, specifically UVFS Mal-1965. This window is designed for use in the near-infrared (NIR) spectrum, specifically between 750 and 1550 nanometers, as indicated by its NIR II coating.
The window is manufactured by Edmund Optics, a leading provider of optical components. It is available for purchase directly from their website, where it is currently listed as in stock. The product's webpage provides detailed specifications and additional information, making it a reliable source for further research.
The 11-900 is shaped as a thin lens, making it suitable for a wide range of optical applications. Its front and back surfaces are coated with Edmund Optics' standard NIR-II curve, which is designed to optimize performance in the near-infrared spectrum.