220-0101E 12.7 mm Dia. N-BK7 Precision Round Window; t=3 mm Uncoated

The 220-0101E is a precision round window, boasting a 12.7 mm diameter and a thickness of 3 mm. Manufactured by EKSMA Optics, this window is made of N-BK7, a popular material in the optical industry due to its excellent optical properties. N-BK7, also known as BK7, is a borosilicate crown glass with a low refractive index and low dispersion, making it an ideal choice for various optical applications.

This window is classified as a flat window, which means it has a planar surface on both sides. The base shape is circular, making it suitable for applications where a circular aperture is required. The geometry of this window is defined by its diameter and thickness, ensuring precise light transmission.

The window is uncoated, meaning it does not have any anti-reflective or other coatings. While coatings can enhance the performance of an optical window, an uncoated window can be advantageous in certain applications, such as where broadband transmission is required, or where the environment is not conducive to coatings.

This window is designed for use with a wavelength of 633 nm. It is important to note that the performance of an optical window can vary depending on the wavelength of the light it is intended to transmit. Therefore, it is crucial to choose a window that is suitable for the specific wavelength of your application.