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| Number | Title | Issue Date |
| 8422020 | Variable spectral element The variable spectroscopic element includes a pair of optical substrates 21-22, four sensors 31-34, four piezoelectric elements 41-44, and a control section. The sensors | 04/16/2013 |
| 8351043 | Planar waveguide wavelength dispersive devices with multiple waveguide input aperture A spectrometer has a multi-input aperture for admitting an input wavefront and an array of multiple waveguide structures terminating at the multi-input aperture. The input wavefront is incident on each of the waveguide structures, which provide a dispersive function... | 01/08/2013 |
| 8351044 | Spectral imaging apparatus provided with spectral transmittance variable element and method of adjusting spectral transmittance variable element in spectral imaging apparatus A spectral imaging apparatus includes: a spectral transmittance variable element having a spectral transmittance characteristics such that a transmittance periodically varies with wavelength and being capable of changing the variation period, for converting light fr... | 01/08/2013 |
| 8289520 | Method for measuring a spectrum of a narrowband light source, and spectrometer arrangement A spectrometer arrangement for measuring a spectrum of a light beam emitted by a narrowband light source, such as a bandwidth-narrowed laser, includes at least one etalon, a beam splitter for splitting the light beam into a first partial beam and a second partial be... | 10/16/2012 |
| 8223339 | Scanning spectroscopy modulation for frequency domain spectral analysis A method for analyzing an optical signal comprising: directing the optical signal into a scanning spectrometer system comprising a variable-wavelength filter and a detector; continuously modulating the variable-wavelength filter at a given modulation frequency to pr... | 07/17/2012 |
| 8203716 | Tandem Fabry-Perot etalon cylindrical beam volume hologram for high resolution/large spectral range diffuse light spectroscopy Systems and methods for performing two-dimensional (2D) high resolution spectral-spatial mapping are described. At least one embodiment includes a spectrometer for performing two-dimensional (2D) high resolution spectral-spatial mapping comprising a Fabry-Perot comp... | 06/19/2012 |
| 8199326 | Gas concentration-measuring device A gas concentration-measuring device makes it possible to measure gas components in a gas sample. An interferometer, based on a dual-band Fabry-Perot interferometer (1), is provided with a transmission spectrum that can be set by a control voltage (38)... | 06/12/2012 |
| 8194252 | Variable spectroscopic element and endoscope system having the same Light in a desired wavelength band is accurately separated by changing the distance between optical substrates while minimizing deformation thereof. A variable spectroscopic element (1) includes: a plurality of optical substrates (3, 4) opposed to each... | 06/05/2012 |
| 8164757 | Fabry-Perot type tunable filter and fabrication method thereof To provide a miniaturized Fabry-Perot type tunable filter that can be applied to e.g. a light of wide wavelength range from infrared rays to ultraviolet rays and actuated at a low voltage. A movable portion moving in a direction parallel to the surface of the... | 04/24/2012 |
| 8134713 | Variable spectroscopy element, spectroscopy apparatus, and endoscope system Sensor electrodes and wiring patterns can be formed with fewer processes, and easy assembly without interference between the wires and optical substrates is realized. Provided is a variable spectroscopy element (1) that includes two optical substrates (3 | 03/13/2012 |
| 8130380 | Spectrometer and interferometric method The invention relates to a spectrometer, a spectrometric method and detector, and a new use of an interferometer. The spectrometer comprises a Fabry-Perot interferometer (120), to which light can be guided from the object (100) being investigated, in o... | 03/06/2012 |
| 8081314 | Variable spectroscopy element, spectroscopy apparatus, and endoscope system Desired spectral characteristics are achieved while achieving reduced size and decreased noise, and detecting the distance between optical substrates with superior precision. Provided is a variable spectroscopy element (1) including optical coating layers ( | 12/20/2011 |
| 7957004 | Interference filter This invention relates to an interference filter, especially for use in gas detection with infrared light within a chosen range, comprising at least two essentially parallel and partially reflective surfaces with a chosen distance between them thus defining a cavity... | 06/07/2011 |
| 7916301 | Filter design for colorimetric measurement A color detector includes a light source configured to generate light with a spectrum of wavelengths; a plurality of filters in optical communication with the light source, wherein each filter is configured to pass a bandwidth of wavelengths around a different peak ... | 03/29/2011 |
| 7864326 | Compact gas sensor using high reflectance terahertz mirror and related system and method A system and method includes a tunable light source and a gas cell configured to detect the presence of gases at terahertz frequencies. The light source is operable to emit a light signal at terahertz frequencies. The gas cell includes at least two high frequency mi... | 01/04/2011 |
| 7852483 | Method and system for sensing light using an interferometric element having a coupled temperature sensor Certain embodiments of the invention provide a light sensor comprising at least one interferometric element that absorbs light in at least one wavelength. The interferometric element comprises a first surface and a second surface substantially parallel to the first ... | 12/14/2010 |
| 7817281 | Tuning optical cavities An inhomogeneous optical cavity is tuned by changing its shape, such as by changing reflection surface positions to change tilt angle, thickness, or both. Deformable components such as elastomer spacers can be connected so that, when deformed, they change relative p... | 10/19/2010 |
| 7796269 | Irregularly shaped actuator fingers for a micro-electromechanical system fabry-perot filter According to one embodiment, a micro-electrical mechanical system apparatus includes (i) a comb drive actuator having at least one irregularly shaped finger and (ii) a movable Fabry-Perot filter cavity mirror coupled to the comb drive actuator. According to some emb... | 09/14/2010 |
| 7755767 | Resonator-amplified absorption spectrometer The invention relates to a device (10) for determining absorption of a sample, comprising an incoherent radiation source (12) for generating a measuring light beam (20), a resonator that is provided with at least two mirrors (30, 32) into... | 07/13/2010 |
| 7733495 | Optical multilayer mirror and fabry-perot interferometer having the same An optical multilayer mirror of a Fabry-Perot interferometer includes a reinforcing section provided as a side wall of each of second and fourth high refractive-index layers. The reinforcing section is configured to support a portion of each of the second and fourth... | 06/08/2010 |
| 7733494 | Bandwidth measuring device for high pulse repetition rate pulsed laser A method and apparatus for estimating bandwidth of laser output light is described which may include a dispersive element producing a dispersed output having a plurality of spectrum images from at least a portion of the laser output light. An array of light detectin... | 06/08/2010 |
| 7705991 | Gas concentration measuring apparatus A gas concentration measuring apparatus is in miniaturized form and permits the measurement of anesthetic gas components. A variable interferometer is provided on the basis of a Fabry Perot interferometer (1) wherein the mirrors (2, 3) can be changed i... | 04/27/2010 |
| 7684046 | Method and apparatus for bandwidth measurement and bandwidth parameter calculation for laser light A bandwidth meter method and apparatus for measuring the bandwidth of a spectrum of light emitted from a laser input to the bandwidth meter is disclosed, which may comprise an optical bandwidth monitor providing a first output representative of a first parameter whi... | 03/23/2010 |
| 7663762 | High-speed transmission system comprising a coupled multi-cavity optical discriminator This invention generally relates to an optical filter for a fiber optic communication system. A coupled multi-cavity optical filter may be used, following a directly modulated laser source, and converts a partially frequency modulated signal into a substantially amp... | 02/16/2010 |
| 7643148 | Apparatus and method for the detection of molecules A THz. spectrometer a includes an adjustable resonator situated between two parabolic mirrors at least one being movable with a stepper motor to create a resonance chamber. A terahertz source irradiated the chamber and a mixer which also receives a signal modulated ... | 01/05/2010 |
| 7639364 | Methods and apparatus for bandwidth measurement and bandwidth parameter calculation for laser light A bandwidth meter method and apparatus for measuring the bandwidth of a spectrum of light emitted from a laser input to the bandwidth meter is disclosed, which may comprise an optical bandwidth monitor providing a first output representative of a first parameter whi... | 12/29/2009 |
| 7595888 | Full-band optical spectrum analyzer and method A method for optical spectrum analysis provides a tunable optical filter and scans a wavelength range of an optical signal that is larger than the free spectrum range of the tunable optical filter. The optical signal is filtered through the tunable optical filter. S... | 09/29/2009 |
| 7589840 | Broad- and inter-band multi-wavelength-reference method and apparatus for wavelength measurement or monitoring systems A wavelength measurement or monitoring system provides a tunable Fabry-Perot optical filter. At least one known light source is used to calibrate and correlate separate wavelength bands scanned by the tunable Fabry-Perot optical filter. At least one wavelength refer... | 09/15/2009 |
| 7573578 | Micro-electromechanical system Fabry-Perot filter mirrors According to one embodiment, a micro-electrical mechanical system apparatus includes first and second mirrors that define a cavity. Moreover, a photonic band-gap structure coats a surface of at least one of the first or second mirrors to improve reflectivity. Anothe... | 08/11/2009 |
| 7564562 | Method for demodulating signals from a dispersive white light interferometric sensor and its application to remote optical sensing A method for demodulating signals from a dispersive, white light interferometer includes generating test interferometry spectra from an interferometer forming part of a sensor for various values of interferometer sensor optical path length. The various test spectra ... | 07/21/2009 |
| 7561274 | Optical spectroscopy utilizing planar spectral filters An optical spectrometer and/or a method of optical spectroscopy is described herein. One exemplary spectrometer includes a planar spectral filter, a dispersion system, and a detector array having at least two dimensions. The planar spectral filter filters incident l... | 07/14/2009 |
| 7554667 | Method and apparatus for characterizing hyperspectral instruments A method and apparatus for characterizing the spectral response function of hyperspectral electro-optical instruments or imaging spectrometers are provided. The system includes a test instrument that provides energy comprising multiple discrete wavelengths to the en... | 06/30/2009 |
| 7551287 | Actuator for micro-electromechanical system fabry-perot filter According to one embodiment, a micro-electrical mechanical system apparatus includes a bi-stable actuator and at least one movable Fabry-Perot filter cavity mirror coupled to the bi-stable actuator. The bi-stable actuator may be associated with a first latched posit... | 06/23/2009 |
| 7538881 | Frequency comb cavity enhanced spectroscopy Cavity enhanced spectroscopy efficiently couples a broadband optical frequency comb to a high finesse optical cavity inside which a sample test gas is placed. The output of the optical cavity is a multiplicity of channels of data resulting from the differential abso... | 05/26/2009 |
| 7535573 | Cavity enhanced optical spectroscopy with a cavity having a predetermined deviation from a mode degeneracy condition Improved ease of mode matching to a passive optical cavity is provided by selecting a cavity design that has a predetermined deviation from a reference cavity design having high transverse mode degeneracy. This predetermined deviation tends to be small, so that the ... | 05/19/2009 |
| 7505137 | Optical wavelength meter An optical wavelength meter for measuring wavelength of an optical beam includes two periodic out of phase fine optical filters (44, 45), using, for example Fabry Perot etalon filters, Fizeau filters, fibre Bragg gratings or photonic crystals. The phases of t... | 03/17/2009 |
| 7483143 | Method and apparatus for conducting heterodyne frequency-comb spectroscopy An apparatus and method are provided for conducting heterodyne frequency-comb spectroscopy. The apparatus includes a first and second frequency-comb generators for generating corresponding first and second continuous wave laser beams, respectively. The first beam de... | 01/27/2009 |
| 7453575 | Spectrometer including a plurality of spectrally diverse filters each outputting multiple discrete wavelength peaks, and associated methods A spectrometer for use with a desired wavelength range includes an array of filters. Each filter outputs at least two non-contiguous wavelength peaks within the desired wavelength range. The array of filters is spectrally diverse over the desired wavelength range, a... | 11/18/2008 |
| 7450240 | Laser device coupled to a cavity by optical feedback for detecting gas traces A device of detection of gas in trace amounts by a semiconductor laser coupled to a resonant optical cavity containing a chemical species to be analyzed. The device comprises a resonant optical cavity containing a chemical species to be analyzed; a semiconductor las... | 11/11/2008 |
| 7441898 | Method and apparatus for detecting natural modes of vibration of an eye by laser interferometry, and an application thereof to measuring intraocular pressure The eye is positioned relative to a detection device in such a manner as to co-operate with the device to form a Fabry-Perot cavity having a main optical axis and comprising two opposite reflecting faces on the main optical axis, one of these two faces being constit... | 10/28/2008 |
