This is a 40 x 65 mm rectangular Beam Splitter, specifically a Thin BS, sourced from Knight Optical. The Beam Splitter is designed for the standard range of 50-50 (R:T) and is suitable for use within the near-infrared (NIR) and telecom spectrum, between 1050-1700nm.
The Beam Splitter is made of soda lime ru clear material and has a thickness of 3mm. It features a Thin Lens shape and is coated with Kni Bi2 on both the front and back surfaces. This coating ensures a balanced 50-50 reflection and transmission rate, which is ideal for various applications.
The item is currently in stock and more detailed information can be found at the following weblink: https://www.knightoptical.com/stock/default/plate-beamsplitter-standard-range-50-50-nir-telecom-1050-1700nm-65x40x3mmthk.html