Abstract: A system that provides a structure which makes use of a recording geometry in which no significant Seidel induced aberrations arise. The recording geometry results in a pattern recorded on a photosensitive surface, thereby creating the hologram on the scanning disc. Reconstruction of the recorded object may be made by exposing the scanning disc to substantially monochromatic light. The hologram on the scanning disc not only directs the reconstruction beam, but also focuses it. An optical element may be used during reconstruction to correct for bow and linearity, and also optimize flatness of the focal plane. Reconstruction also involves achromatization, or correction of beam placement because of mode hops or drift in laser frequency. The reconstruction comprises both pre-scan holograms and post-scan holograms. Recording of the post-scan hologram is achieved with a plurality of lenses which possess different collimating properties in the vertical and horizontal planes.

Abstract: A system that provides a structure which makes use of a recording geometry in which no significant Seidel induced aberrations arise. The recording geometry results in a pattern recorded on a photosensitive surface, thereby creating the hologram on the scanning disc. Reconstruction of the recorded object may be made by exposing the scanning disc to substantially monochromatic light. The hologram on the scanning disc not only directs the reconstruction beam, but also focuses it. An optical element may be used during reconstruction to correct for bow and linearity, and also optimize flatness of the focal plane. Reconstruction also involves achromatization, or correction of beam placement because of mode hops or drift in laser frequency. The reconstruction comprises both pre-scan holograms and post-scan holograms. Recording of the post-scan hologram is achieved with a plurality of lenses which possess different collimating properties in the vertical and horizontal planes.

Abstract: A scanner system which uses rotating, high efficiency holograms to deflect a light beam thereby achieving a linear scan. The hologram is unique in that it allows high system efficiency without requiring the input polarization to be aligned to the fringe pattern.

Abstract: An electro-optical scanner which can write and read with common optics by using a phase hologram near the focal plane of the scanned surface.

Abstract: A system having a scaled anti-aliasing random phase filter for use in optical imaging systems having a sampled focal plane or an automatic focussing device. The filter is scaled so that it may be placed near the focal plane or automatic focus sensing device, yet produce the effect of an anti-aliasing filter at the exit pupil of the optical system. In one example, the filter includes a scaled hologram of a Sayanagi filter located at the exit pupil. In a second example, the filter includes a scaled double chirped diffraction grating.

Abstract: A hologram recording system useful for recording holograms for use on a film strip tape in an optical retreival system is disclosed. The recording system permits accurate centering of a selected one of a series of frames. A hologram for use on a film strip tape is recorded with interfering divergent beams of .lambda..sub.1 wavelength coherent wave energy for readout with a plane wave of .lambda..sub.2 wavelength coherent wave energy to provide a reconstruction in a plane spaced a preselected distance Z.sub.3 from the plane of the hologram record being read out. The respective distances Z.sub.1 and Z.sub.2 of the effective optical crossovers of the two divergent recording beams from the plane of the hologram recording medium are uniquely functionally related to the preselected distance Z.sub.3 and the ratio .lambda..sub.2 /.lambda..sub.1.

Abstract: The use of a lenticular array in the formation of the object-illuminating beam used in the recording of either a Fresnel, a Fraunhofer or an image plane hologram, permits the reconstructed image of the object, on playback of the hologram, to be directly viewed over an expanded image viewing area.

Abstract: A deflection-type modulator, for insertion in the path of a laser beam directed to a remote receiver, includes a mirror mounted on a voice coil device and positioned in the focal plane of a lens. A prism reflects the laser beam at right angles through one-half of the lens to a focal point on the mirror. The beam is reflected back through the other half of the lens, and is reflected by another face of the prism normally to a point between two spaced photosensors at the remote receiver. An electrical audio signal applied to the voice coil device causes the laser beam to be deflected back and forth between the two photosensors at the remote receiver.

Abstract: An electro-optical scanner which can write and read with common optics by using a phase hologram near the focal plane of the scanned surface.