220-0722M 75.0 mm Dia. N-BK7 Precision Round Window; t=12.7 mm Uncoated

The 220-0722M is a precision round window offered by EKSMA Optics, a leading vendor in the optical components industry. This window, designed for use with lasers, boasts a base shape of a flat circular disc, providing an unobstructed view of the optical path.

The window has a diameter of 75.0 mm, making it suitable for a wide range of applications that require larger apertures. It features a thickness of 12.7 mm, providing sufficient structural integrity while minimizing optical distortion. The window is made of N-BK7, a high-quality borosilicate glass known for its excellent optical properties, including high transmission in the visible spectrum and low auto-fluorescence.

This particular window is uncoated, meaning it does not have any additional layers applied to its surface. While coatings can enhance certain properties such as transmission or durability, an uncoated window offers the benefit of simplicity and versatility, allowing it to be used in a wide range of environments and applications without the risk of coating damage or degradation.

The window's geometry is that of a thin lens, further minimizing optical distortion and ensuring a clear, undistorted view of the optical path. This makes it an ideal choice for applications that require high precision and clarity, such as laser systems, interferometry, and optical metrology.