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7916393 |
Optical level control device, method for controlling same, and laser application device
The optical level control device independently controls the intensities of two beams having different wavelengths that are emitted from a laser oscillator, and the optical level control device...
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7894134 |
Sinusoidal polarization
A linearly polarized transparent or translucent material is stretched to follow a sinusoidal shape so all parts of the resulting panes or lenses are themselves sinusoidal. By providing a structure...
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7643212 |
Rotationally tunable optical delay line
A rotationally tunable time delay line device for providing a continually adjustable time delay between two orthogonally polarized laser pulses is described. The device is comprised of one or more...
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7570426 |
Apparatus and system for wide angle narrow-band optical detection in daylight
Techniques for filtering light include, along a central optical axis, an entrance window; a first polarizer, a narrowband polarization-changing material, a second polarizer, and an exit window. The...
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7413317 |
Polarized UV exposure system
A light exposure system is used to expose an alignment layer formed of anistropically absorbing molecules so as to allow alignment of subsequently applied liquid crystal polymer (LCP) molecules....
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7382536 |
Objective with fluoride crystal lenses
An objective for a microlithography projection system has at least one fluoride crystal lens. The effects of birefringence, which are detrimental to the image quality, are reduced if the lens axis...
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7375889 |
Apparatus and method for controlling polarization in an optical communications medium
A method for resetting a polarization controller includes determining that the phase magnitude is associated with a first range of phase angles and generating a first control signal having a first...
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7355789 |
Phase filter
An optical device with a focusing optic that focuses a light beam in a focal plane and brings about a phase shift between a first part of the light beam and a second part of the light beam. The...
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7327518 |
Attenuator for high-power unpolarized laser beams
A method for attenuating an unpolarized laser beam includes separating the laser beam into two plane-polarized beams. The plane-polarized beams are polarization rotated. Each of the...
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7324280 |
Apparatus for providing a pattern of polarization
A polarization pattern assembly produces a polarization pattern. In an embodiment, a polarization pattern assembly includes a frame that supports a polarization pane in a central region of the...
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7308171 |
Method and apparatus for optical isolation in high power fiber-optic systems
Methods and apparatus for optical isolation in high peak power fiber-optic systems prevent damage to a facet within a fiber-optic isolator caused by back-reflected light from, for example, an...
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7286289 |
Surveillance window
A surveillance window including at least one set of linear polarizer and quarter-waveplate and a reflecting surface. The surveillance window appears dull and opaque to a subject, while allowing a...
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7236301 |
Polarized light valve
A projection system for making an object appear and disappear to an observer on cue. The system remotely activates a reflective axis and a transmissive axis within a polarized window for making an...
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7230763 |
Polarizing beamsplitter
A polarizing beamsplitter is provided, comprising two wedge-shaped prisms of a birefringent material, the prisms forming a plan-parallel plate, wherein an incident light beam is separated into two...
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7227686 |
Tunable PMD emulators and compensators
Tunable PMD emulators and compensators for producing different PMD profiles with an adjustable average DGD value.
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7196847 |
Device and method for an optical tunable polarization interface filter
The tuner has constituent component for constructing a tunable or switchable spectral filter, including single and multiple stage filters and fitters without intermediate polarizer, over a...
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7184213 |
Rod integrators for light recycling
An integrating rod (200) for use with a multiple segment dynamic filter, such as a spiral dichroic color wheel having three or more narrow filters adjacent to the exit face (206) to enable the...
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7173763 |
Optical interleaver and filter cell design with enhanced clear aperture
An optical interleaver for use in a range of telecommunications applications including optical multiplexers/demultiplexers and optical routers. The optical device includes an optical processing...
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7170680 |
Privacy screen for a display
A privacy screen for a vertically polarized display (e.g., a LCD) that comprises a rotating film, a polarizing film and a birefringent film is described. The privacy screen transmits substantial...
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7170679 |
Optically active color filter
An optically active color filter for controlling the color of light produced by a light source. The color filter includes an optically active device positioned between a linear polarizer and an...
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7154670 |
Methods and apparatus for polarization control
Methods and apparatus of performing polarization control for optical transmissions. The methods and apparatus enable polarization control devices to achieve a desired output state of polarization...
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7154668 |
Wavelength dependent optical attenuator and variable attenuation profile controller
The attenuation profile of an optical system, which defines the power variation as a function of wavelength is adjusted to alter the slope of its contour. The device is useful in a wavelength...
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7130123 |
Polarization conversion element and optical system containing such polarization conversion element
A polarization conversion element with four phase plates laminated on a substrate plate, in the order of first, second, third and fourth phase plates from a light incident side. The first and...
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7095559 |
Variable optical delay circuit
In a variable optical delay circuit to be used for compensation for polarization mode dispersion of an optical signal and for other purposes, there are provided a first birefringent member, a...
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7085052 |
Over-parameterized polarization controller
A controller, particularly for setting a desired or randomized polarization state of an output light beam derived from an input, has more than the minimum number of controllable optical elements...
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7061680 |
Adjusting contrast in an optical system
An improved object projection system provides an observer with a surrounding background that has adjustable contrast levels relative to an object. A transmissive polarizer and a reflective...
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7012748 |
Method for adjusting a wave plate for an imaging system
A compact mounting for a wave plate permits convenient rotational adjustment of the wave plate through an angle of at least one-half revolution to exploit asymmetry in the optical characteristics...
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6996297 |
PMD emulation, measurement and compensation device
A PMD emulation, measurement and compensation device is based upon an emulation device having a piece of fiber having a fixed differential group delay (DGD) and another short piece of fiber (or...
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6988811 |
Optical exposure apparatus and method for aligning a substrate
A system for processing a multilayer liquid crystal film display material, with multiple irradiation apparatus (60) for applying a zone of polarized UV irradiation onto a substrate fed from a web...
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6909544 |
Method for eliminating strong ambient light in aircraft cockpits
Light is polarized in perpendicular directions between a source of light and a users viewing of information on a display device. A first sheet of polarized material is placed at the source of the...
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6865305 |
Adaptively controllable polarization mode dispersion compensator
A polarization converter followed by two PMFs adjusts principal states of polarization (PSP) of a PMD compensator against PSP of an optical transmission line, and a mode-coupling adjuster between...
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6857745 |
Method of manufacturing illumination optical unit, apparatus for manufacturing illumination optical unit, illumination optical unit manufactured by the manufacturing method, and projector
A first positioning step positions and fixes a light focusing element and a polarization converting element. A beam introducing step introduces beams to a beam splitting element, the light focusing...
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6847484 |
Methods and apparatus for generating polarization mode dispersion
Methods and apparatus for coherent polarization mode dispersion generation are provided. A generator can include at least four birefringent stages. The birefringent stages are in optical series,...
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6842283 |
Generation of variable differential group delay
An apparatus for generating variable DGD is particularly for use in a PMD compensator. The apparatus has first, second and third birefringent elements arranged in order between the input and output...
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6765723 |
Compensation of polarization-dependent distortion such as PMD
A PMD compensator has three compensation elements in series, each for providing variable differential group delay. Each compensation element provides compensation along a different orthogonal...
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6717729 |
Polarized light irradiation apparatus
A polarized light irradiation apparatus, having at least two plane mirrors, is constructed to prevent reduction of the extinction ratio of the polarized light that irradiates a substrate when there...
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6717730 |
Tunable optical filter
An optical filter including first and second polarizers, a Faraday rotator and a birefringent element operating together to filter light with a changeable optical transmittance versus wavelength...
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6650306 |
Security-enhanced display device
A device for displaying images only to an authorized user includes a display device configured to display the images. The display device includes a backlight for generating incident light of mixed...
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6646801 |
Glare reduction system and method
A system and method for reducing glare is provided in accordance with the present invention. The system may include a first polarizer transmitter for filtering light from a source, and a second...
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6597506 |
Birefringent optical devices and methods
An optical device includes a first birefringent crystal having a refractive index difference Δn1 and a length l1 and a second birefringent crystal having a refractive index difference Δn2 and a l...
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6597505 |
Apparatus for producing and guiding a light beam
Apparatus for producing and guiding a light beam, in particular for a laser interferometer, includes a laser having a laser tube (100) and an external cavity (112). Two laser beams (110A′ and 1...
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6552850 |
Device, method, and system of display for controlled viewing
The present invention provides a device, method, and system for secure viewing and use of banking and other electronic access devices. The present invention comprises a computer/video display...
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6535335 |
Optical polarization encoder
An optical polarization encoding device has been invented which allows wavelength dependent processing of polychromatic optical signals without prior separation into narrow wavelength bands. The...
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6481851 |
Adjustable contrast reflected display system
A transparent-reflective display constructed to be alterable so that reflected images are viewed upon a transparent surface that can alter to a darkened surface, thereby changing contrast of the...
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6348998 |
Polarization phase plate assembly
Polarization phase plate Assembly comprises at least two uniaxial crystal plates which are identical to each other in structure and dimension and a retarder plate sandwiched between the two...
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6347164 |
Variable polarization dependent loss source
A fiber optic device that is capable of producing a variable amount of polarization dependent loss. The device consists of two lenses for coupling light out of the fiber and into the device and for...
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6342968 |
Frequency tuning of optical devices
Methods and apparatuses for tuning optical devices are described. Optical devices can be tuned by inserting tuning plates into the optical path(s) of the devices. Tuning plates can be, for example,...
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6275337 |
Method for viewing through reflections from a reflective surface without affecting point of impact
Featured is a method and device that minimize the effects of reflections from a transparent surface while viewing an object or target area through such reflective surface and which accomplishes...
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6262843 |
Polarizing privacy system for use with a visual display terminal
The privacy system apparatus and method of the present invention allow users of a publicly accessible terminal to privately access information displayed on a visual monitor of the terminal. In one...
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6249379 |
Optical beam power controller using a tiltable birefringent plate
The present invention is an inexpensive optical beam power controller for providing fast, continuous control of a linearly polarized optical beam, such as a beam from a laser. In essence, the...
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