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7417796 |
Wavelength discrimination filter for infrared wavelengths
An optical comb filter has polarizers placed before and after two or more birefringent elements, each having a fixed retarder and an aligned tunable liquid crystal. The birefringent elements are...
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7397604 |
Narrow bandpass filter assemblies for solar telescopes
The invention relates to the combination of lower transmittance etalons with higher transmittance filters, including use of a single circular polarizer with high efficiency and optical performance...
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7394188 |
Phosphor based light source component
A method of making a light source includes the steps of forming a first optical component having a phosphor material in fixed relation to a first multilayer interference reflector, providing a...
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7362489 |
Multi-conjugate liquid crystal tunable filter
A hyper-spectral imaging filter has serial stages along an optical signal path with angularly distributed birefringent retarders and polarizers forming interference filters. The retarders can...
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7268944 |
Optical interleaver, filter cell, and component design with reduced chromatic dispersion
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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7215473 |
Enhanced heat mirror films
A heat mirror film containing visible light-transmissive and infrared reflective film comprising a birefringent dielectric multilayer support that reflects at least 50% of light in a band at least...
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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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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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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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7164530 |
Polarizing filter and optical device using the same
A polarizing filter has a laminate structure: wherein one to four layers of first dielectric thin films 1 and one to four layers of second dielectric thin films 2 are alternately laminated on a...
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7151632 |
Apparatus for production of an inhomogeneously polarized optical beam for use in illumination and a method thereof
An apparatus for producing an inhomogeneously polarized optical beam from a homogeneously polarized input optical beam includes a first phase shifter, a second phase shifter, and one or more...
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7113338 |
Thin-film structure and method for producing the same
A thin-film structure includes plate-shaped metals or plate-shaped structures in which a plate-shaped metal and a plate-shaped dielectric are in contact. The plate-shaped metal or structures are...
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7113337 |
Multilayer optical coating
Anisotropic multilayer thin-film coating that may be used in fabrication of various optical elements, such as polarizers, beam splitters, interference-polarizing light filters, polarizing mirrors,...
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7106509 |
Filter for enhancing vision and/or protecting the eyes and method of making a filter
The selective filtering of light by polarization interference may be used to enhance vision and/or protect eyes from harmful light rays. For example, such filtering may be used in sunglasses, color...
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7106508 |
Hybrid cell
The present invention is a hybrid cell that utilizes a PBS pair in conjunction with a wedge tuner and a crystal to achieve a more stable interleaver. A first PBS splits an incoming optical signal...
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7075719 |
Optical filter and optical device provided with this optical filter
Light emitted from a taking lens 20 enters a first birefringent plate 1 a to be spatially divided along a first direction extending perpendicular to the direction in which the light advances to...
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7038852 |
Polarization conversion optical system and polarization conversion element
A polarization conversion optical system converts light having a nonuniform plane of polarization into light having a uniform plane of polarization. The system includes a multilayer dielectric film...
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7038745 |
Brightness enhancing reflective polarizer
A multiple layer reflective polarizer 12 is described. This element is placed between and optical cavity 24 and an LCD module 16 to form an optical display. The reflective polarizer reflects...
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7006279 |
Optical harmonic equalization control systems and methods
Devices and methods for equalizing the gain of an optical amplifier are described. For devices including harmonic filters that are controllable by amplitude control voltages and phase control...
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6982831 |
Athermal birefringent optical interleavers with flat-top passbands
A spectral interleaver providing flat top spectral transmission passbands and athermal operation is disclosed. The spectral interleaver may comprise a pentagon-shaped birefringent crystal, a...
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6967776 |
Polarizing filter and optical device using the same
A polarizing filter has a laminate structure: wherein one to four layers of first dielectric thin films 1 and one to four layers of second dielectric thin films 2 are alternately laminated on a...
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6963448 |
Optical low-pass filter, and image sensing unit and apparatus using the same
If the thickness of a birefringence plate that forms an optical low-pass filter is not appropriately set, problems in terms of optical characteristics or machine works are posed. Hence, there is...
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6961181 |
Compensated color management systems and methods
Beamsplitters are frequently used in projectors based on reflective liquid crystal display for separating input and output light, and more recently for color management systems. Rather stack...
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6940648 |
Optical low pass filter
There is provided an optical low pass filter, which is provided with a first birefringence plate that divides an incident ray into two rays, a second birefringence plate that divides an incident...
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6900938 |
Low dispersion interleaver
An apparatus for channel interleaving comprises a spatial birefringent device assembly and a reflector which is configured so as to direct light from the spatial birefringent device assembly back...
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6897434 |
All-fiber photon-pair source for quantum communications
A source and/or method of generating quantum-correlated and/or entangled photon pairs using parametric fluorescence in a fiber Sagnac loop. The photon pairs are generated in the 1550 nm fiber-optic...
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6888677 |
Multilayer optical bodies
Optical bodies, comprising: a plurality of first optical layers comprising a first polymer composition that comprises (i) a polyester portion having terephthalate comonomer units and ethylene...
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6888675 |
Transflective displays with reflective polarizing transflector
A transflector is described which increases efficiency and brightness under both ambient and supplemental lighting conditions in visual display applications. In one embodiment, the transflector...
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6885821 |
Full-duplex optical add/drop communications system utilizing central light sources
The present invention provides an improved full-duplex optical communications system. The system includes: at least one office, where the at least one office provides a plurality of channels, the...
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6882778 |
Chromatic dispersion compensation in waveguide arrays
A flat-top arrayed waveguide grating with a Hyper-Gaussian distribution function and a modified sinc design exhibits a very low chromatic dispersion, low loss and requires a relatively small number...
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6871022 |
Cascaded optical multiplexer
Methods and apparatus for multiplexing and demultiplexing optical signals. An interleaver having a modified Mach-Zehnder interferometer as a first stage is used as a wavelength division...
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6865024 |
Multi-functional optical device utilizing multiple polarization beam splitters and non-linear interferometers
The present invention provides a multi-functional separator which may be used as a demultiplexer or as a multiplexer in wavelength division multiplexed optical communication systems. The preferred...
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6850364 |
Method and apparatus for an optical multiplexer and demultiplexer with an optical processing loop
An optical device that can be used in a range of telecommunications applications including optical multiplexers/demultiplexers and optical routers. The optical device includes an optical processing...
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6847786 |
Compact wavelength filter using optical birefringence and reflective elements
A wavelength division multiplexing/demultiplexing device is presented utilizing a polarization-based filter to separate odd and even wavelengths, or upper and lower channels of an input optical...
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6847420 |
Liquid crystal display with reflecting polarizer
A liquid crystal display is provided which comprises front and rear panels, and electrodes, polarizers and a layer of liquid crystal disposed between the front and rear panels. The polarizer on the...
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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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6839177 |
Anti-reflective coating for holographic data storage media
A holographic data storage medium having an anti-reflective coating is described. The anti-reflective coating can be made to reduce reflectivity for S-polarized light over a wide range of incident...
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6829396 |
Wavelength characteristic control device, gain equalizer, and light amplifier
A wavelength characteristic control device capable of variably controlling a wavelength characteristic in a satisfactory manner. A polarized light wavelength characteristic changing element has a...
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6816309 |
Compensated color management systems and methods
Beamsplitters are frequently used in projectors based on reflective liquid crystal displays for separating input and output light, and more recently for color management systems. Retarder stack...
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6809863 |
Low dispersion filters
A low dispersion comb filter or interleaver assembly has a first interleaver element and a second interleaver element. The first interleaver element is configured so as to provide a dispersion vs....
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6809782 |
Diffusing polarizing member and liquid crystal display
A diffusing/polarizing member ( 1 ) is provided which comprises a laminate ( 1 ) of a reflective polarizer ( 12 ) which separates incident natural light into a reflected light comprising a...
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6791753 |
Retro-reflective fiber optic interleaver
Fiber optical interleavers based on a retro-reflective structure are disclosed. The retro-reflective structure includes three stages of optical components. A first stage includes walk-off crystals,...
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6788463 |
Post-formable multilayer optical films and methods of forming
Articles including post-formed multilayer optical films with layers of at least one strain-induced birefringent material, methods of manufacturing such articles by post-forming multilayer optical...
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6751415 |
Reduction of polarization-dependent loss from grating used in double-pass configuration
A wavelength router is provided for receiving, at an input port, light having a plurality of spectral bands and directing some of those spectral bands to various output ports. The wavelength router...
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6731430 |
Low crosstalk flat band filter
A filter for filtering electromagnetic radiation has two polarization selection elements and a birefringent element assembly disposed intermediate polarization selection elements. The birefringent...
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6724539 |
Interleaver
The light which is input from an optical fiber to a first port is output to an optical path. The light which is input from the optical path to a half mirror is branched into two, and is output to...
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6724531 |
Optical low-pass filter
An optical low-pass filter used in association with an imaging element which has a plurality of pixels arranged in vertical and horizontal direction with regularity, is provided with first through...
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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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6704143 |
Method and apparatus for adjusting an optical element to achieve a precise length
In a device and method, the optical path length through an optical element is adjustable with high precision. The optical element has a first segment formed from a first optical material, the first...
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6697198 |
Optical interleavers/deinterleavers
Interleaver/deinterleaver apparatuses for combining/separating optical channels are described. When operating as a deinterleaver, the interleaver/deinterleaver separates an optical signal (e.g. WDM...
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