20B20BS.3 50.8 mm Dia. 50:50 (R:T) N-BK7 Broadband Dielectric Plate Beamsplitter; t=9.4mm 1290-1580nm

This product is a 50.8 mm diameter beamsplitter, designed for use in the 1290-1580nm wavelength range. Manufactured by MKS/Newport, it is a 50:50 beamsplitter, meaning it evenly splits incoming light between its reflection and transmission paths.

The beamsplitter is made from N-BK7, a type of borosilicate glass known for its excellent optical properties. This material is sourced from Schott, a leading manufacturer of high-quality optical glass. The beamsplitter's thickness is 9.4mm, providing sufficient structural integrity while minimizing unwanted optical effects.

The beamsplitter features a New BS.3 coating on the front surface and a New NC.3 coating on the back surface. These coatings are broadband dielectric coatings, designed to maximize reflectance and transmittance within the specified wavelength range. The coating on the front surface reflects 50% of incoming light, while the coating on the back surface transmits 50% of incoming light.

The beamsplitter's geometry is that of a thin lens, which helps to minimize optical aberrations and distortions. This makes it suitable for use in a wide range of optical systems, including interferometers, spectrometers, and laser systems.