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| Number | Title | Issue Date |
| 8159671 | Spatially precise optical treatment for measurement of targets through intervening birefringent layers A treatment pattern (such as a focused spot, an image, or an interferogram) projected on a treatment target may lose precision if the treatment beam must pass through a birefringent layer before reaching the target. In the general case, the birefringent layer splits... | 04/17/2012 |
| 8040510 | Spatially precise optical treatment or measurement of targets through intervening birefringent layers A treatment pattern (such as a focused spot, an image, or an interferogram) projected on a treatment target may lose precision if the treatment beam must pass through a birefringent layer before reaching the target. In the general case, the birefringent layer splits... | 10/18/2011 |
| 7952711 | Waveplate analyzer based on multiple tunable optical polarization rotators Systems, apparatus and methods for characterizing linear retarders using a waveplate analyzer constructed by polarization rotators. In one implementation of such an analyzer, both the retardation of the waveplate sample and the orientation of optical axis of the wav... | 05/31/2011 |
| 7952712 | Method for detecting equatorial plane To provide a method for detecting the equatorial plane, capable of detecting directly an equatorial plane that has the optical axis as the axis thereof, in a spherical optically uniaxial crystal. The method for detecting the equatorial plane as set forth in a first ... | 05/31/2011 |
| 7948623 | Method for evaluating color filter, color filter and liquid crystal display device A method of evaluating a color filter including a substrate, and at least three color pixels disposed thereon, the method includes determining an oblique visibility of a liquid crystal display device equipped with the color filter on the basis of value ξ1 | 05/24/2011 |
| 7940390 | Compact background-free balanced cross-correlators A compact, background-free, balanced cross-correlator enables (a) the detection of a timing error between two ultrashort pulses with (sub-)femtosecond resolution and (b) the timing synchronization of ultrashort pulse lasers using the output signal of the detector to... | 05/10/2011 |
| 7940389 | Method and apparatus for detecting pressure distribution in fluids A pressure sensing apparatus has a light source for transmitting pulses of light along a monomode optical fiber. The polarization of light backscattered from the light pulses in the optical fiber is detected by a polarization processing unit (PPU) and a photo detect... | 05/10/2011 |
| 7920263 | Apparatus and system for electro magnetic field measurements and automatic analyses of phase modulated optical signals from electrooptic devices An apparatus, for measuring an electric field while minimally perturbing the electric field being measured, includes an analyzing stage and a sensor head. The sensor head is optically coupled to the analyzing stage by a laser probe beam transmitted from the analyzin... | 04/05/2011 |
| 7907280 | Method of constructing a deviation angle self compensating substantially achromatic retarder to compensate beam traslation A method of configuring a system for introducing a relative phase retardation into orthogonally polarized components of an electromagnetic beam entered thereinto, wherein the system involves a substantially achromatic multiple element retarder system for use in wide... | 03/15/2011 |
| 7884934 | Method and apparatus for biogenic substance concentration measurement The present invention provides an apparatus for biogenic substance concentration measurement including: a cell including therein a first region, a second region, and a test solution retention space; a light source; a polarizing plate; and a photoreceiver, in which a... | 02/08/2011 |
| 7808636 | Systems, methods, and devices for handling terahertz radiation Methods and apparatus for detecting variations in electromagnetic fields, in particular, terahertz (THz) electromagnetic fields, are provided. The methods and apparatus employ polarization detection devices and controllers to maintain or vary the polarization of mod... | 10/05/2010 |
| 7751044 | Optical sensors for downhole measurements using birefringent materials A sensor for measuring in a borehole at least one of orientation, acceleration and pressure, the sensor including: a light source; a birefringent material receiving light from the source; and a photodetector for measuring light transmitted through the birefringent m... | 07/06/2010 |
| 7746470 | Optical scanning device and method of deriving same The present invention relates to an optical scanning device that comprises a light source to emit a beam of light, and a beam splitter to split that beam into several beamlets, and further a first objective lens to direct said beamlets onto a focal plane wherein eac... | 06/29/2010 |
| 7626700 | Mosaic quantification by birefringence measurement A crystal optical material is illuminated at a wavelength of light that does not ionize the crystal optical material. Birefringence is measured between a plurality of voxels within the crystal optical material having spatial dimensions small enough to distinguish op... | 12/01/2009 |
| 7477389 | Deformable photoelastic device A toy, art object, decoration, ornament, entertainment device, advertising device, paperweight, or other device is made of a soft deformable plastic material in shapes of prisms, lenses, wedges, cubes, pyramids, as well as other forms that display the changing stres... | 01/13/2009 |
| 7471394 | Optical detection system with polarizing beamsplitter An optical detection system for use in flow cytometry or the like, which includes a polarizing beamsplitter 820 such as a Wollaston prism. A light source provides an input light beam to a flow stream, wherein the input light beam has a polarization direction.... | 12/30/2008 |
| 7460230 | Deviation angle self compensating substantially achromatic retarder A substantially achromatic multiple element compensator system for use in wide spectral range (for example, 190-1700 nm) rotating compensator spectroscopic ellipsometer and/or polarimeter systems. Multiple total internal reflections enter retardance into an entered ... | 12/02/2008 |
| 7450231 | Deviation angle self compensating substantially achromatic retarder A substantially achromatic multiple element compensator system for use in wide spectral range (for example, 190-1700 nm) rotating compensator spectroscopic ellipsometer and/or polarimeter systems. Multiple total internal reflections enter retardance into an entered ... | 11/11/2008 |
| 7443504 | Arbitrary and endless polarization controller and polarization-mode dispersion compensator using the same and arbitrary and endless polarization controlling method A polarization controller is configured to comprise polarization state monitoring section for monitoring polarization states of input light and output light of a variable polarization light element; and a control section, when the positions on a Poincare sphere expr... | 10/28/2008 |
| 7427932 | Compressive sampling and signal inference An optical signal is copressively sampled using an imaging system. The imaging system is created from a plurality of subimaging systems. Each subimaging system comprises a subaperture and a plurality of sensors. The optical signal is collected at each subaperture of... | 09/23/2008 |
| 7411677 | Driverless ellipsometer and ellipsometry A small and high-speed polarization analysis device and ellipsometer having no driving section are provided by overlapping one polarizer array rendered by arranging a plurality of polarizer regions of mutually different optical axis directions in the form of stripes... | 08/12/2008 |
| 7385696 | Birefringence measurement of polymeric films and the like Provided are methods for determining the birefringence level of optical material such as polymeric film. In one embodiment, the method uses a setup of optical components that has known system reference angle. The sample may be a stretched polymeric film that has a f... | 06/10/2008 |
| 7385698 | System and method of selectively monitoring sample front and backside reflections in ellipsometer and the like systems A spectrophotometer, reflectometer, ellipsometer polarimeter or the like system having a detector means for independently intercepting electromagnetic radiation reflected from a sample frontside or backside, and methodology for pursuing less correlated determination... | 06/10/2008 |
| 7365833 | System for measuring radiance, transmittance and reflectance Two or more triangular apertures are employed to pass radiation from a source to a detector to reduce the amount of stray radiation received by the detector. Preferably, the two apertures are equilateral triangles oriented at 60 rotated relative to each other and ha... | 04/29/2008 |
| 7336360 | Imaging polarimetry To effectively reduce a measurement error in a parameter indicating two-dimensional spatial distribution of a state of polarization generated by variations in retardation of a birefringent prism pair due to a temperature change or other factors, while holding a vari... | 02/26/2008 |
| 7330259 | Optical measurements of patterned articles A method and system are presented for use in measuring/inspecting a patterned article. Optical measurements are applied to a measurement site on the article by illuminating the measurement site with a plurality of wavelengths at substantially normal incidence of the... | 02/12/2008 |
| 7327455 | Process monitoring system, process monitoring method, and method for manufacturing semiconductor device A process monitoring system has a process chamber configured to hold an object to be processed, an illumination source configured to emit a light to the object, a polarizer configured to polarize the light, a monitor window having a birefringent material and provide... | 02/05/2008 |
| 7322250 | System and method for sensing torque on a rotating shaft A system and method relating to the measuring of torque in a rotating shaft is provided. An optical torque sensing system comprises a rotating shaft, wherein a sleeve of photo-elastic material overlays a portion of the shaft. A light emitting component delivers ligh... | 01/29/2008 |
| 7317528 | Ellipsometer, measurement device and method, and lithographic apparatus and method An ellipsometer includes an optical component and a detector. The optical component has two birefringent parts in optical communication via a border surface. Light incident on the border surface is split into two reflected and two transmitted components. The detecto... | 01/08/2008 |
| 7312869 | Out-of-plane birefringence measurement The disclosure is directed to precise measurement of out-of-plane birefringence properties of samples of transparent optical material. Two angled-apart light beams are passed through a selected location of a sample optical element. One of the beams is incident to th... | 12/25/2007 |
| 7310145 | Apparatus and method for determining optical retardation and birefringence A method for determining the optical retardation and birefringence values of an anisotropic material utilizing a Fourier transform near infrared spectrophotometer operated in at least a portion of the range of wavenumbers between about 4,000 to about 10,000 cmâ... | 12/18/2007 |
| 7307722 | Polarization stabilization A polarization stabilizing device and method based on controlling the phase retardation of a pair of variable phase retarders with a controller such that the first of the variable retarders has its phase retardation switched between first and second values whenever ... | 12/11/2007 |
| 7304736 | Method and apparatus for measuring polarization A method of nonlinear polarimetry for measuring higher order moments of the E field of an optical signal is provided. The method includes imposing a phase delay on a first polarization of a received optical signal with respect to a second polarization of the optical... | 12/04/2007 |
| 7301974 | Wavelength monitoring apparatus An optical signal emitted from a semiconductor laser is converged by a lens and then received by a single uniaxial birefringent crystal having a C axis that is inclined at an angle other than 90 degrees against a laser optical axis to output an optical signal having... | 11/27/2007 |
| 7301632 | Polarization state conversion in optically active spectroscopy The invention describes a method to eliminate instrumental offset in measurement of optically active scattering and circular dichroism. The method uses the time-average measurement of the light that is systematically transformed by a series of optical devices. The o... | 11/27/2007 |
| 7292389 | Circular extinction contrast imaging microscope Systems and methods for producing circular extinction (CE) contrast images of anisotropic samples. Microscope systems for determining circular extinction (CE), the differential transmission of left and right circularly polarized light resulting from circular dichroi... | 11/06/2007 |
| 7287855 | Method and system for removing the effects of corneal birefringence from a polarimetric image of the retina A scanning laser polarimetry (SLP) system that measures retinal nerve fiber layer (RNFL) retardance in a single scan image with improved sensitivity. An external bias retarder in combination with the anterior segment retardance forms a nonzero joint retardance adapt... | 10/30/2007 |
| 7286226 | Method and apparatus for measuring birefringence Disclosed is a birefringence measuring apparatus and method for measuring birefringence of a sample in a reduced time and in a simple manner. The birefringence measuring apparatus includes a light projecting unit for projecting approximately circularly polarized lig... | 10/23/2007 |
| 7283234 | Use of ellipsometry and surface plasmon resonance in monitoring thin film deposition or removal from a substrate surface Improved methodology for monitoring deposition or removal of material to or from a process and/or wittness substrate which demonstrates a negative e1 at some wavelength. The method involves detection of changes in P-polarized electromagnetism ellipsometric DE... | 10/16/2007 |
| 7283231 | Compressive sampling and signal inference A transmission mask or cooled aperture is used in spectroscopy to compressively sample an optical signal. The locations of transmissive and opaque elements of the mask are determined by a transmission function. The optical signal transmitted by the mask is detected ... | 10/16/2007 |
