66-188 25 mm Dia. N-BK7 Ultra-Thin Protective Flat Window; t=0.2 mm Uncoated

The 66-188 is a 25 mm diameter uncoated ultra-thin protective flat window, designed and manufactured by Edmund Optics. This window is made from N-BK7, a popular borosilicate glass known for its excellent optical properties, including a high Abbe number and low dispersion. The window features a base shape of a circle, making it suitable for a wide range of applications.

The geometry of this window is particularly noteworthy. It has a diameter of 25 mm and a thickness of just 0.2 mm, making it one of the thinnest protective windows available. This ultra-thin design not only reduces weight and space requirements but also minimizes optical distortions and aberrations.

The window is designed to operate at a wavelength of 587.6 nm, which falls within the visible light spectrum. This makes it ideal for applications that involve visible light, such as imaging, metrology, and beam manipulation.

The window is uncoated, meaning it does not have any anti-reflective or other coatings. While this may result in higher reflective losses, it also means that the window is more versatile and can be used in a wider range of applications without the risk of coating damage or degradation.