45-076 25 mm Dia. N-BK7 Precision Protective Flat Window; t=4 mm Uncoated

The 45-076 is a 25 mm diameter, 4 mm thick uncoated flat window made from N-BK7 glass, a popular material in the optical industry due to its excellent optical properties. This window, sourced from Edmund Optics, is a precision protective component designed for use in various optical systems.

The window's base shape is circular, making it suitable for applications where a circular aperture is required. The N-BK7 material, also known as BK7, is a borosilicate crown glass with a low refractive index and low dispersion, making it an ideal choice for many optical applications.

The window has a thickness of 4 mm, providing sufficient protection for the optical components it is shielding, while maintaining a reasonable weight and size. The uncoated surface allows for versatility in application, as the user can apply the coating that best suits their specific needs.

This window is designed to be used at a wavelength of 587.6 nm, a common visible light wavelength. It is shaped as a thin lens, which means it has a very small curvature, making it suitable for applications where minimal optical distortion is required.