Patent
Optical information storage system
TLDR
In this article, a wideband holographic information storage system was proposed to record Fourier holograms on film in rapid succession, each hologram storing 128 bits of data, and the hologram fringe pattern was held stationary by varying the reference beam frequency to track the variations of frequency of the signal beam that are caused by acoustic-optic modulation of signal beam.Abstract:
A wideband holographic information storage system records Fourier holograms on film in rapid succession, each hologram storing 128 bits of data. The hologram fringe pattern is held stationary by varying the reference beam frequency to track the variations of frequency of the signal beam that are caused by acoustic-optic modulation of the signal beam. Holograms are successively recorded in adjacent positions by scanning a light beam across a photosensitive film with a rotating polygonal mirror, the recording light beam being wide enough to cover two facets of the mirror so as to achieve nearly 100% scanning duty cycle. During readout, a readout light beam is steered to compensate for prismatic deflection effects caused by variations in thickness of the film. The direction of the output beam is maintained constant despite a scanning motion of the incident readout beam, by reflecting the output beam a second time from a different facet of the polygonal mirror to compensate the rotational component of beam motion. Clocking of output data is self-synchronized, based upon modulation signals. Acoustically caused defocusing of the light beam is optically corrected. Methods are employed to reduce crosstalk.read more
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References
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Patent
Laser printing system
TL;DR: In this article, a modulated laser beam was developed in a non-contacting printing arrangement, where the laser beam swept across an ink bearing carrier disposed adjacent a printing surface, e.g., an untreated paper sheet.
Patent
Flying spot scanner
TL;DR: In this paper, a flying spot scanning system is provided by utilizing reflected light from a multifaceted rotating polygon which is then directed to the scanned medium, and an optical convolution of elements is selected in combination with the light source such that an adequate depth of focus at the medium is assured.
Patent
Method for writing information at nanosecond speeds and a memory system therefor
TL;DR: In this paper, a method for writing information at ultra-high speed onto a memory material, limited only by the pulse time of a laser beam employed, is presented, where information may be written and stored by exposing discrete portions of the semiconductor material to a high speed pulsed laser wherein said exposed portions are converted from the crystalline to the amorphous state.
Journal ArticleDOI
High speed holographic digital recorder.
TL;DR: Concepts, feasibility experiments, and key component developments are described for a holographic digital record/reproduce system with the potential for 1.0 Gbit/sec rates and higher.