Patent ID: 7742378

Claim:
A method of recording at least two multiplexed holograms comprising the steps of reflecting either an object beam or a reference beam from at least one aspherical reflecting surface having two focal points, said at least one aspherical reflecting surface having portions that correspond to azimuthal angles spanning an azimuthal arc of 360°, the object beam and the reference beam generated by a coherent light source, thereby causing the object beam and the reference beam to intersect and form an interference pattern at a selected storage location in a recording media at or near one of the two focal points, thereby recording a first hologram at said selected storage location; and rotating at least one of a portion of the reference beam impinging on a recording media at the selected storage location and a portion of the object beam impinging on the recording media at said selected storage location through a selected azimuthal angle about an axis that lies in the plane formed by optical axes of said portions of the object beam and the reference beam impinging on the recording media, wherein said axis passes through the selected storage location, and wherein an angle between optical paths of said portions of the object beam and the reference beam impinging on the recording media is preserved, thereby recording at least two azimuthally multiplexed holograms.