OPB-12.7C05-4-5 12.7 mm Dia. N-BK7 Round Optical Parallel Flat Window; t=5 mm Uncoated

The OPB-12.7C05-4-5 is a 12.7 mm diameter N-BK7 round optical parallel flat window with a thickness of 5 mm, sourced from OptoSigma. This window is a type of flat window, designed with a base shape of a circle, which is a common geometry in optical systems due to its symmetry and ease of alignment.

The window is made of N-BK7, a type of glass commonly used in optical systems due to its excellent optical properties. N-BK7, also known as Schott glass, has a refractive index of approximately 1.5168 at a wavelength of 588 nm, making it suitable for a wide range of applications.

The window is uncoated, meaning it does not have any additional layers applied to its surface to alter its optical properties. This can be beneficial in certain applications where the natural properties of the glass are desired. However, it's important to note that uncoated windows can be more susceptible to environmental factors such as dust, moisture, and scratches, which can affect their performance.

The window is designed in the shape of a thin lens, which is a lens with a very small focal length compared to its diameter. This shape is often used in optical systems where a large aperture is required, but the lens must be as compact as possible.

According to the vendor's website, this item is currently in stock, making it readily available for immediate use in your optical system.