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| Number | Title | Issue Date |
| 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 |
| 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 |
| 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 |
| 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 |
| 7433552 | Obtaining analyte information Light, such as from an analyte-wavelength converter or other optical sensor, is propagated to a detector or transmission structure with an entry surface and with output positions such as in an exit surface. For example, the position of light output by such a detecto... | 10/07/2008 |
| 7425453 | Integrated circuit porphyrin-based optical Fabry-Perot chemical sensor A Fabry-Perot cavity has a pair of partially transmissive, partially reflective, surfaces. A first of the surfaces is flexibly suspended adjacent and parallel to a second of the surfaces. A gap exists between the surfaces. A variable electrostatic potential permits ... | 09/16/2008 |
| 7420686 | Wavelength measurement method based on combination of two signals in quadrature In a dual etalon wavelength monitor, improved performance is obtained by identifying first and second dead zones where the first and second etalon signals respectively have significantly reduced sensitivity. When a measurement is in the first dead zone, only the sec... | 09/02/2008 |
| 7411686 | Methods and apparatus for aligning an etalon with a photodiode array A method and apparatus are disclosed for measuring a characteristic, e.g. spectral bandwidth, of a light beam. The apparatus may comprise an etalon for generating an interference pattern having at least one light cone, an arrangement of detector elements, the arrang... | 08/12/2008 |
| 7387892 | Biosensor using microdisk laser A compact sensor for detecting the presence of biological or chemical species includes a microdisk laser and a wavelength shift detector. The microdisk laser is coated with a biological or chemical recognition element, which binds preferentially with a target analyt... | 06/17/2008 |
| 7385704 | Two-dimensional spectral cameras and methods for capturing spectral information using two-dimensional spectral cameras A low cost spectral camera may include a multiple Fabry-Perot cavity filter with silicon photodetectors distributed one beside another in a two-dimensional matrix fashion. Each cavity may be designed to capture a pixel from an image. The two-dimensional fabry-perot ... | 06/10/2008 |
| 7379166 | Combined laser altimeter and ground velocity measurement apparatus and a fiber optic filter edge detector of doppler shifts for use therein A fiber optic filter edge detector of Doppler shifted light comprises: a laser source for emitting pulsed laser light substantially over a first fiber optic path; an optical lens for directing laser light emitted from the first fiber optic path to free-space and for... | 05/27/2008 |
| 7369252 | Process control monitors for interferometric modulators Process control monitors are disclosed that are produced using at least some of the same process steps used to manufacture a MEMS device. Analysis of the process control monitors can provide information regarding properties of the MEMS device and components or sub-c... | 05/06/2008 |
