OFBP-40C06-20 40 mm Dia. N-BK7 Round Precision Polished Flat Window; t=6 mm Uncoated

The OFBP-40C06-20 is a 40 mm diameter, 6 mm thick flat window made of N-BK7 glass, a popular material in the optical industry due to its excellent optical properties and high damage threshold. This window, sourced from OptoSigma, is a circular, thin lens type, designed for precision applications that require high-quality, uncoated optical surfaces.

The N-BK7 glass, also known as Borosilicate Crown, is a borosilicate crown glass with a refractive index of approximately 1.5168 at 588 nm. It is known for its low coefficient of thermal expansion, making it resistant to thermal shock. This property, combined with its high homogeneity and excellent transmission in the visible and near-infrared regions, makes N-BK7 a versatile and reliable choice for various optical applications.

The window's flat, precision-polished surfaces ensure minimal optical aberrations, making it suitable for use in beam shaping, beam splitting, or as a protective window in high-power laser applications. The uncoated surfaces provide excellent optical transmission but may exhibit some reflective loss, typically around 4% per surface.

This window is currently in stock and available for immediate purchase through the provided weblink. With its robust design, high-quality materials, and precision manufacturing, the OFBP-40C06-20 is an excellent choice for a wide range of optical applications.