NPCH-20-7800 20 x 20 mm 50:50 (R:T) N-BK7 Non-polarizing Cube Beamsplitter; t=20mm 780nm

The NPCH-20-7800 is a non-polarizing cube beamsplitter offered by OptoSigma, designed for use in various optical systems. This beamsplitter is characterized by its 20 x 20 mm geometry, making it suitable for applications requiring a compact, cube-shaped optical element.

The beamsplitter features a 50:50 reflection-to-transmission ratio, meaning it evenly splits incoming light into reflected and transmitted components. This characteristic is particularly useful in applications where balanced light distribution is required, such as interferometry or beam combination setups.

The NPCH-20-7800 is crafted from N-BK7 glass, a popular material in optical systems due to its excellent optical properties and versatility. This beamsplitter is designed to operate at a wavelength of 780 nm, making it suitable for near-infrared applications.

The beamsplitter's coating is another notable feature. Both the front and back surfaces are coated with ideal broadband anti-reflection (AR) coatings, minimizing unwanted reflections and improving overall transmission. The hypotenuse faces also receive specialized coatings: one with an OptoSigma-specific coating (NPCH-7800) and the other with an ideal broadband AR coating.