| Patent Number |
Title Of Patent |
Date Issued |
| 5510912 |
Method and apparatus for modulation of multi-dimensional data in holographic storage |
April 23, 1996 |
| A modulator apparatus for modulating arrays of input data V.sub.in to be stored in a holographic recording medium is disclosed wherein the final output data array V.sub.out has frequent transitions from light to dark and from dark to light in either dimension across the data page and has |
| 5202875 |
Multiple data surface optical data storage system |
April 13, 1993 |
| An optical data storage system comprises a multiple data surface medium and optical head. The medium comprises a plurality of substrates separated by a light transmissive medium. Data surfaces are located on the substrate surfaces which lie adjacent a light transmissive medium. The data |
| 5166989 |
Integrated polarization detection system |
November 24, 1992 |
| A substrate has a pair of overlapping optical couplers for separately coupling a first and a second polarization component of a light beam into a first and a second waveguide channel. The channels are oriented with their longitudinal axis approximately perpendicular to each other. A firs |
| 5031993 |
Detecting polarization state of an optical wavefront |
July 16, 1991 |
| An improved apparatus and method for detecting the polarization state of an optical wavefront is disclosed, which is especially suitable for use in an integrated magneto-optic recording head. An optically transparent waveguide structure transmits TE and TM modes of the wavefront propagat |
| 4585315 |
Brightfield/darkfield microscope illuminator |
April 29, 1986 |
| A brightfield/darkfield microscope illuminator has two axicon mirrors and a third plane mirror for use with two light beams from different sources. An open shutter positioned in the path of one beam provides brightfield illumination. An open shutter positioned in the path of the other be |
| 4540244 |
Opto-optical light deflector/modulator |
September 10, 1985 |
| An opto-optical light deflector/modulator has means for providing first and second coherent wave fronts of wavelength (.lambda..sub.0) to travel in a transparent optical active medium to produce an optically generated standing wave that induces a periodic refractive index variation in th |
| 4533211 |
Frequency multiplexed optical spatial filter based upon photochemical hole burning |
August 6, 1985 |
| A frequency multiplexed optical spatial filter is based upon a thin film of a photochemical hole burning material. The filter stores a plurality of images in the photochemical hole burning medium. The images are formed at different optical frequencies and coexist in the same volume of th |
| 4497534 |
Holographic optical head |
February 5, 1985 |
| A holographic optical head for imaging a laser diode for optical storage or magnetic tracking applications includes three holograms, a beam director and a quarter-wave plate. In a preferred embodiment the beam director is a fourth hologram. The holographic optical head is corrected for a |
| 4444456 |
Holographic method and apparatus for transformation of a light beam into a line source of requir |
April 24, 1984 |
| Apparatus for producing a line source of a desired shape from a radiation source such as a laser comprising means for directing the radiation source along a predetermined path as a playback beam to impinge upon a hologram at a predetermined angle to produce a continuous self-luminous sou |
| 4436420 |
Optical fluid analyzing apparatus and method |
March 13, 1984 |
| An optical fluid analyzing apparatus is shown comprising transparent means (12,13) of known refractive index (n.sub.1) providing a cell (14) for receiving a fluid sample of unknown refractive index (n.sub.2). A diffraction grating 10 is formed in an inner wall (11) of the cell. A lig |
| 4432597 |
Transmissive holographic optical element on aberrating substrate |
February 21, 1984 |
| An inexpensive, high quality transmissive holographic optical element and method for making same are described. The holographic optical element consists of a potentially aberrating substrate which supports a layer of holographic recording material. The material contains a recorded fringe |
| 4422713 |
Method for making high efficiency holograms |
December 27, 1983 |
| A method for making high diffraction efficiency holograms from dichromated gelatin (DCG) including the steps of curing the DCG for a specified time under controlled temperature and humidity conditions, periodically removing the DCG material from the curing conditions, placing a dye spot |
| 4275395 |
Interactive projection display system |
June 23, 1981 |
| An interactive projection display system having a light pen device for use thereon is described. The projection display system has an image of a light valve on a projection screen which is formed by visible light of specified wavelengths. The projection screen also has a translatable |
| 4249796 |
Projection display device |
February 10, 1981 |
| A projection display device is provided in which variation in the index of refraction is used to modulate attenuated total reflection. |
| 4165155 |
Amplitude modulation of light beam |
August 21, 1979 |
| An optical modulator suitable for use with a collimated light beam having a moderate cross section and a fast response time and operational at relatively low voltage includes, for example, a glass prism and a smooth metal surface that are separated by an adjustable gap. The gap is filled |
| 4126456 |
Visual image recording device |
November 21, 1978 |
| A direct view display device comprises a pair of conductive electrodes in spaced relationship and a recording medium having the properties of being both photo-ionizable and capable of electro-chemically producing colored species occupies the space between the electrodes. The display devi |
