Pellicle beamsplitters are comprised of a nitrocellulose membrane mounted under tension in a metal housing. Since the membrane is only a few microns thick, the second surface reflection is superimposed on the first, effectively eliminating ghosting. Beamsplitters are fundamental components in optical engineering, serving to precisely divide a single input beam of light into two distinct output beams. This division allows for the simultaneous analysis or utilization of the light's properties along two separate paths. For example, in quantum information the beam splitter plays essential roles in teleportation, bell measure-ments, entanglement and in fundamental studies of the photon. The splitter is based on InP, has the area 65. Under condition of no air-hole defect, the splitting.