The 11-904 is a 30 mm diameter, 4 mm thick flat window made from UVFS material, specifically UVFS Mal-1965. This window is designed for use in the near-infrared (NIR) spectrum, with a wavelength of 587.6 nm. The window is coated with EDM NIR-II standard curve on both the front and back surfaces, providing excellent protection and performance in the NIR II range of 750-1550 nm.
The window's thin lens shape and circular geometry make it suitable for a wide range of optical applications. The vendor, Edmund Optics, provides a valid link to the product, indicating its availability in stock. This window is an excellent choice for users seeking a high-quality, reliable optical component for use in the NIR spectrum.