39-251 38.1 mm Dia. AR Coated Sapphire Protective Flat Window; t=1 mm VIS-NIR 400-1000nm

The 39-251 is a high-quality protective flat window offered by Edmund Optics, designed for use in the visible to near-infrared spectrum (VIS-NIR) range of 400-1000nm. This window is a circular flat window, boasting a diameter of 38.1mm and a thickness of 1mm, making it a versatile and robust option for various optical applications.

The window is made from sapphire, a material with the chemical formula Al2O3, which is known for its exceptional hardness, second only to diamond, and its excellent resistance to scratching and environmental damage. This makes the 39-251 an ideal choice for applications that require a high degree of durability and longevity.

The 39-251 is coated with Edmund Optics' proprietary AR coating, identified as edm visnir0sp2002000, on both the front and back surfaces. This anti-reflective coating is designed to minimize surface reflections and increase transmission in the VIS-NIR range, further enhancing the window's performance and utility.

The window is shaped as a thin lens, which can be beneficial in applications where a flat window is required but a lens-like shape can provide additional functionality or convenience. This window is currently in stock and available for immediate purchase, as indicated by its weblink status.