Abstract: A rotating cylindrical or prismatic reflective body (28, . . . 428) is used as a beam splitter in a laser system in which an outgoing pulsed high-energy beam (12) and a low-energy return beam (30) from a target follow coincident optical paths. During one portion of rotation of its rotation cycle, the reflective surface (42, . . . 442) is removed from the optical path to permit passage of the high-energy laser pulse past a bypass surface (44, . . . 444). During a second portion of its rotation cycle, the body reflects the target return beam to a sensor (34).

Abstract: Apparatus and method is disclosed for forming an elliptical surface in a mirror 10. The mirror blank is rotated about a given axis and the cutting tool tip 24 is pivoted about an axis C which is generally perpendicular to and spaced from the workpiece axis 16. As the cutting tip 24 moves in an arcuate path about point C the instantaneous radius R between the cutting tip and the C axis is adjusted by way of a linkage 34 which translates movement generated by a cam surface 36 and follower arm 32 into horizontal movement of the tool cutting tip 24.