NPCH-20-5145 20 x 20 mm 50:50 (R:T) N-BK7 Non-polarizing Cube Beamsplitter; t=20mm 514.5nm

The NPCH-20-5145 is a non-polarizing cube beamsplitter offered by OptoSigma, designed for use in optical systems that require beam splitting at a 50:50 ratio. This beamsplitter is specifically designed for a wavelength of 514.5 nm and features a 20 mm x 20 mm aperture, making it suitable for a wide range of applications.

The beamsplitter is constructed from N-BK7 glass, a popular material in optical systems due to its excellent optical properties and high damage threshold. The geometry of the beamsplitter is a cube, with each side measuring 20 mm, providing a robust and compact design.

The NPCH-20-5145 offers a reflection coefficient of 0.5 and a transmission coefficient of 0.5 at the design wavelength. This 50:50 split ensures that the incident light is evenly divided between the reflected and transmitted beams.

The beamsplitter's coating is another notable feature. Both the front and back surfaces are coated with ideal broadband anti-reflection (AR) coating, reducing unwanted reflections and improving transmission. The hypotenuse faces 1 and 2 are also coated, with the former featuring an Opt NPCH-5145 coating and the latter having an ideal broadband AR coating.