The beamsplitter plate is a thin optical glass plate. The first face is coated with an all-dielectric thin film having partial reflection properties. The second surface is multilayer AR coated for 45° or some other specified angle. This beamsplitter has low absorption and high damage threshold, suitable for high-energy laser applications where cemented cubes may fail. We provide three kinds of plates, all with strictly guaranteed splitting ratio but are distinguished in the polarization of the incoming and outgoing beams. For BS plates, we get partially polarized outgoing beams for randomly polarized incoming light. For PBS plates, we obtain both s-polarized and p-polarized beams from randomly polarized incoming light. For NPBS plates, the polarization of the outgoing beams remains the same when the incoming beam is 45° linearly polarized or circularly polarized.

This beamsplitter is a thin plate with an all dielectric BS coating on one side. The other side is AR coated for a certain waveband. It has the advantage of very low energy loss and is especially useful in high power applications where cemented device may fail.

Superior high energy polarizer performance is achieved through advanced coating design and meticulous production procedures. These optics have been developed for use in some of the most powerful energy laser systems. The polarizing coatings have been optimized for use with Nd:YAG lasers. When the laser light is incident at Brewster's angle, Tp>95%,Ts<0.5% and the extinction ratio is greater than 100:1.