39-248 25.4 mm Dia. AR Coated Sapphire Protective Flat Window; t=2.3 mm VIS-NIR 400-1000nm

This product is a high-quality flat window offered by Edmund Optics, a renowned vendor in the optical industry. The window, identified as 39-248, is designed with a diameter of 25.4 mm and a thickness of 2.3 mm, making it a robust and compact solution for various optical applications.

The window is crafted from Sapphire, a material with the Al2O3 Mal-1972-N-O ID, which is known for its exceptional hardness, chemical resistance, and outstanding transparency across a wide spectrum. This particular window is designed to transmit light in the Visible (VIS) and Near-Infrared (NIR) range, specifically from 400 to 1000 nm, making it suitable for a broad range of applications.

The window features Anti-Reflective (AR) coatings on both the front and back surfaces, identified as 'edm visnir0sp2002000'. These coatings are specifically designed to reduce reflection and increase transmission, thereby enhancing the performance of the optical system in which this window is used.

The window's geometry is that of a thin lens, suggesting that it may have some light bending properties, although this is not its primary function. The lens shape could be beneficial in certain applications where a flat window is not sufficient.