39-246 6.35 mm Dia. AR Coated Sapphire Protective Flat Window; t=0.5 mm VIS-NIR 400-1000nm

This product is a high-quality protective flat window offered by Edmund Optics, a renowned vendor in the optical industry. The window, identified as item 39-246, boasts a diameter of 6.35 mm and a thickness of 0.5 mm, making it a thin and lightweight option for various applications.

The window is made of 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 wear. Sapphire is also transparent across a wide spectrum, making it an ideal material for optical applications, particularly in the visible (VIS) and near-infrared (NIR) ranges, from 400 to 1000 nm.

The window features anti-reflective (AR) coatings on both the front and back surfaces, specifically the EDM VISNIR0SP2002000 coating. This coating is designed to minimize reflection and optimize transmission in the VIS and NIR ranges, further enhancing the window's performance in these spectral regions.

The window's geometry is that of a thin lens, which can provide some focusing or diverging properties depending on the application. However, its primary function is to protect the optical elements behind it from environmental hazards such as dust, dirt, and moisture.