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4746193 |
Apparatus for stabilization of high speed optical pulses
An optical system including an input pulse source for providing an input optical pulse the intensity of which is sufficiently high to result in stimulated Raman scattering; and a first optical...
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4735486 |
Systems and methods for processing optical correlator memory devices
An optical correlator memory processing system. By operating the system within preselected maximum and minium wavelengths, by preselecting certain parameters of the system, and by operating the...
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4662653 |
Optically diffracting security element
A security element for authenticating bank notes, credit cards, security passes and the like is disclosed. The security element incorporates a reflective-type diffraction grating, which grating...
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4655547 |
Shaping optical pulses by amplitude and phase masking
Embodiments of the present invention control, manipulate and tailor the shape of input optical pulses to produce substantially transform-limited output pulses which can be shorter than the input...
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4632517 |
Crystalline colloidal narrow band radiation filter
A narrow wavelength band filtering device is provided by forming a highly ordered crystalline colloidal structure within a cell. The crystalline colloidal structure is relatively thin and has...
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4568147 |
Flat profile grating coupler
A device for efficiently coupling electromagnetic radiation in the far-infrared and submillimeter microwave regions of the electromagnetic spectrum to surface electromagnetic waves comprising a...
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4561721 |
Attenuator for optical radiation
In the representative embodiments described herein, an attenuator of optical radiation, and specifically high-intensity laser radiation, comprises a plurality of diffracting sheet members,...
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4560249 |
Method of forming diffraction gratings and optical branching filter elements produced thereby
A method for making a diffraction grating utilizing a laser source, a beam splitter to split the light from the laser source into two light fluxes, a collimator to convert each light flux into a...
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4555162 |
Method of fabricating long period optical grating
A long period buried optical grating is fabricated by polishing a number of single crystal silicon wafers to identical thicknesses and flat figure, applying a light reflective metallic coating to...
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4496634 |
Diffraction grating wire arrays in parallel
Arrays of substantially parallel metallic wires of micron and sub-micron dimensions are made by directionally solidifying the components of a eutectic alloy system as a thin film and subsequently...
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4496216 |
Method and apparatus for exposing photosensitive material
Exposure patterns are formed in photosensitive material by multiple beam laser interferometry by a method which involves exposing said photosensitive material simultaneously to at least three...
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4494235 |
Multiple wavelength laser
A pulsed or CW laser is rapidly switched to operate at one or more selectable wavelengths by means of intracavity insertion of beam dispersion and focussing elements and an apertured focal plane...
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4492738 |
Diffraction grating wire arrays in series
Arrays of substantially parallel metallic wires of micron and sub-micron dimensions are made by directionally solidifying the components of a eutectic alloy system as a thin film and subsequently...
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4476161 |
Method of producing a buried long period grating
A method of producing a buried long period grating which is substantially unaffected by material stability, high tolerance requirements, stringent machining requirements, and heat transfer. The...
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4469407 |
Laser apodizing filter
A laser beam apodizing filter comprising a print-out silver image comprised of silver grains having a diameter of about 0.5 μm or less, said image being proportional in density distribution to the...
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4440839 |
Method of forming laser diffraction grating for beam sampling device
A combined holographic grating that samples a high energy laser beam and focuses the sample into a spot is formed by the cross-modulation term of a linear holographic grating and a holographic zone...
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4440468 |
Planar waveguide bragg lens and its utilization
The planar waveguide Bragg lens and a component utilizing a planar waveguide Bragg lens with a greater acceptance angle characterized by several grating structures being arranged in series and...
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4397558 |
System for reducing the effects of background radiation
A system for reducing the effects of background radiation on a desired signal includes a plurality of physically spaced phase shifters arranged in a two-dimensional array and disposed in the path...
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4389094 |
Process for casting on a support the faithfull reproduction of a mask pierced with periodically distributed slits
A process is disclosed which consists of choosing the wavelength of a plane incident wave to lie in the range 2d/3≤λ≤2d, where d is the pitch of the slits so that there exist only two...
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4389096 |
Image display apparatus of liquid crystal valve projection type
A liquid crystal light valve projection type image display apparatus comprises an electro-optic element and a Schlieren optical system. The electro-optic element has a liquid crystal layer having a...
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4371264 |
Optical system for aligning two patterns and photo-repeater using such a system
An optical system for aligning two patterns particularly by photo-repetition in which a first pattern formed by two optical networks, disposed along two coordinate axes is illuminated by the image...
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4358200 |
Optical focussing-error detection system
A focussing error detection system is described for determining deviations between the plane of imaging of an objective system in an optical arrangement and the radiation-reflecting surface in said...
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4355898 |
Optical detecting, monitoring or measuring arrangements
According to the present invention there is provided an optical detecting, monitoring or measuring arrangement, comprising a movable diffraction grating arranged for angular displacement by means...
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4331972 |
Light valve, light valve display, and method
A light valve comprises a pair of elements of transparent material each comprising a diffraction grating of like periodicity facing each other with parallel grating lines. Such a light valve is...
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4330211 |
Method and apparatus for detecting small angular beam deviations
A method and apparatus for detecting small angular deviations of an input beam which utilizes a pair of diffraction gratings in series, both of which are operating in the Wood's anomaly region. As...
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4327966 |
Variable attenuator for laser radiation
The invention relates to a variable attenuator having two phase gratings (1 and 2) with rectangular grooves. In a first embodiment of the present invention the gratings are slidably mounted (10,...
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4306763 |
Optical source comprising a semiconductor laser and optical means for the anamorphosis of the beam emitted by said laser
An optical source comprising a semiconductor laser having an emissive junction and optical means for the anamorphosis of the beam emitted by said laser. The optical means comprise a concave...
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4281905 |
Magneto-optic light deflector beam recombination apparatus
An apparatus for and a method of parallelizing the conjugate deflected light beams of a magneto-optic light deflector system. The apparatus includes two converging half-lenses, the centers of which...
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4269932 |
Process for preparing an original information carrier for zero-order diffraction
A process for producing a relief original information carrier is disclosed comprising the steps of exposing a recording layer mounted on a carrier to a grating pattern, image-wise exposing the...
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4195909 |
Scanning grating for a focus detector
An improved scanning grating useful as an image scanner and spatial frequency filter, for a focusing detector to ascertain the focus of an optical system on deflecting the light incident from the...
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4174881 |
Recording a synthetic focused-image hologram on a thermally deformable plastic
A synthetic focused image hologram of a white light image is recorded as variations in the depths of grooves of a diffraction grating in a layer of thermoplastic material located on a layer of...
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4158481 |
System and method for viewing a three-dimensional image using a two-dimensional drawing
Two-dimensional figures which are to be represented in three-dimensional images consist of a series of lines or line segments which may be in the form of hand drawings, two-dimensional printed...
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4146783 |
Multiplexed optical communication system
The system permits the multiplex telecommunication through the medium of an optical carrier wave. The system comprises a source of coherent light whose optical spectrum is dispersed in an optical...
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4140362 |
Forming focusing diffraction gratings for integrated optics
An apparatus is disclosed for making unchirped holographic diffraction gratings that are formed from curved lines in a thin film. The gratings so made focus as well as reflect light that is...
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4123149 |
Unstable resonator having high magnification
An unstable resonator having high magnification and capable of accommodating an active medium having high gain and small dimensions is disclosed. The unstable resonator, formed with a pair of...
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4091281 |
Light modulation system
A system for one dimensional or multi-dimensional modulation of light proportional to the path, angle or speed, preferably the photoelectric signal analysis of the movement of an object carrier in...
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4084880 |
Coherent optical computer for polynomial evaluation
A holographic polynomial computer in which powers and products of the input variables are obtained by repeated diffraction at the input hologram. The information bearing beams are split,...
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4048492 |
Method and apparatus for automatic focusing an optical system with a scanning grating
Method and apparatus for automatically focusing an optical system, particularly a microscope. A grating is located in the intermediate image plane and acts as a spatial frequency filter. A...
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4039370 |
Optically monitoring the undercutting of a layer being etched
A technique for optically monitoring the undercutting of a layer of material being selectively etched beneath a pattern of masking material in an etchant comprises forming on a layer of the...
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4034460 |
Method of forming an optical grating
An optical grating having expansion characteristics equivalent to the thermal expansion characteristics of a preselected material is formed by providing a thin grating sheet of a material different...
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4033052 |
Optical teaching aid
A teaching aid for demonstrating the component pure spectral colors of white light and the effect of selective recombination thereof. It utilizes the diffraction principle to produce a spectrum...
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4011435 |
Optical indicia marking and detection system
An optical marking system which utilizes tags that are formed from multiple diffraction gratings, which gratings differ in orientation and number of lines (frequency) in accordance with the coded...
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3944326 |
Waveguide
A waveguide for submillimeter and infrared wavelength range electromagnetic radiation comprises a metal grating with a grating constant criterion: ##EQU1## BEING GREATER THAN (2/λ) 2 , WHERE λ IS...
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RE28702 |
Noninteracting lens system for a color encoding camera
In a color camera utilizing a color encoding strip filter arrangement in the optical path to separate light from an object into its component colors, an imaging system includes a noninteracting...
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3924925 |
Focussed image hologram projector using a long narrow light source
A filamentary light source and condenser system provide one or more light beams for illuminating a frequency-encoded focussed image hologram, the light diffracted therefrom being decoded by a...
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3917378 |
Frequency-encoded focussed image hologram record
A hologram comprising three superimposed parallel diffraction gratings, each modulated by a different primary color component of an imaged object and having a different spatial frequency related to...
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3891975 |
Method and arrangement for recording the phase distribution of an object wave stored in a hologram
The object wave stored in the hologram has intensity maxima. The hologram is scanned and a pulse is furnished for each of the intensity maxima. This creates a spatial distribution of pulses. The...
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3840738 |
OPTICAL COMMUNICATIONS SYSTEM WITH MEANS FOR MINIMIZING MATERIAL DISPERSION
The bandwidth of an optical communications system utilizing a transmission line constructed of a dispersive medium is significantly increased by use of a particular type of repeater and/or...
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3767310 |
DIFFRACTION GRATING BEAM SPLITTER
The optical system divides a beam of coherent radiation into a pair of beams having powers according to a desired ratio. The primary beam is intercepted by a holographic diffraction grating...
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3749922 |
APPARATUS FOR READING OUT INFORMATION DATA
Apparatus for reading out information data stored on a transparent carrier in the form of diffraction screens by means of which the individual areas of the information carrier are read out...
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