Beam splitter for interferometer, has lateral face forming angle greater than ninety degrees with front face, where splitter thickness and distance between former face and incidence zone are equal so that ghost beam emerges via lateral face

摘要

The splitter has a front face (41), a rear face (42) and four lateral faces. The lateral face (46) is perpendicular to an incident plane and forms an angle greater than 90 degrees with the front face. The thickness of the splitter and a distance between the lateral face and an incidence zone of the front face provided for receiving an incident beam are equal such that a ghost beam emerges from the splitter through the face (46).