The 37-073 is a 75 mm diameter, 4 mm thick Flat Window made from N-BK7 Schott glass. This window is sourced from Edmund Optics and is currently in stock. It is designed for use in the near-infrared spectrum, specifically between 600 and 1050 nanometers.
The window features a thin lens shape and is coated with Edmund Optics' standard NIR-I coating on both the front and back surfaces. This coating is specifically designed to optimize performance in the near-infrared range. The N-BK7 Schott glass is a popular choice for optical applications due to its excellent optical properties and high damage threshold.
For more detailed information, please refer to the vendor's website using the provided weblink: https://www.edmundoptics.com/p/75mm-dia-4mm-thick-nir-i-coated-4-n-bk7-window/37347/