1. Articles in category: Patents

    1-24 of 2094 1 2 3 4 ... 86 87 88 »
    1. Tunable short cavity laser sensor

      Tunable short cavity laser sensor

      Optical systems employ a tunable source which includes a short cavity laser with a large free spectral range cavity, fast tuning response, and single transverse and longitudinal mode operation. Systems for optical spectroscopy with optimized scanning, a system for optical beam steering and a system for a tunable local oscillator are disclosed.

      Read Full Article
    2. Polarization stable widely tunable short cavity laser

      Polarization stable widely tunable short cavity laser

      A tunable source includes a short-cavity laser optimized for performance and reliability in SSOCT imaging systems, spectroscopic detection systems, and other types of detection and sensing systems. A short cavity laser with a large free spectral range cavity, fast tuning response and single transverse, longitudinal and polarization mode operation is disclosed. Methods for obtaining polarization stable operation of the tunable source are presented.

      Read Full Article
    3. Polarization-sensitive optical measurement instrument

      Polarization-sensitive optical measurement instrument

      A beam emitted from a light source is split into a probe beam that irradiates a measurement object and a reference beam that does not irradiate the measurement object. A signal beam obtained by the reflection of the probe beam is split into first and second split signal beams, which are mutually orthogonal polarized components. The first split signal beam and the reference beam are inputted to a first coherence optical system to cause the beams to interfere with each other to generate at least three coherence beams differing in phasic relationship. The second split signal beam and the reference ...

      Read Full Article
    4. Apparatus and method for capturing a vital vascular fingerprint

      Apparatus and method for capturing a vital vascular fingerprint

      A method using optical coherence tomography to capture the microvascular network of the superficial layer of the finger skin for the purpose of fingerprint authentication and liveness detection. At the dermal papilla region, the vascular pattern follows the same pattern of the fingerprint and this vascular pattern forms a live vascular fingerprint. This live vascular fingerprint provides for ultrahigh security and a unique way for fingerprint-based personal verification. Because the system is based on blood flow, which only exists in a living person, the technique is robust against spoof attaching. After performing non-contact in-vivo imaging of a human fingertip, a ...

      Read Full Article
    5. Methods and computer program products for quantitative three-dimensional image correction and clinical parameter computation in optical coherence tomography

      Methods and computer program products for quantitative three-dimensional image correction and clinical parameter computation in optical coherence tomography

      Methods and computer program products for quantitative three-dimensional ("3D") image correction in optical coherence tomography. Using the methods and computer program products, index interface (refracting) surfaces from the raw optical coherence tomography ("OCT") dataset from an OCT system can be segmented. Normal vectors or partial derivatives of the curvature at a refracting surface can be calculated to obtain a refracted image voxel. A new position of each desired refracted image voxel can be iteratively computed. New refracted corrected voxel positions to an even sampling grid can be interpolated to provide corrected image data. In some embodiments, clinical outputs from the ...

      Read Full Article
    6. System and method for generating and utilizing a valid sweep signal to obviate spurious data and increase sweep rate in an akinetic path-based swept laser

      System and method for generating and utilizing a valid sweep signal to obviate spurious data and increase sweep rate in an akinetic path-based swept laser

      A system and method for triggering data acquisition in a semiconductor laser system including outputting electromagnetic energy from the semiconductor laser over a range of wavelengths according to a signaling path. The signaling path includes a plurality of discrete data inputs to the semiconductor laser for outputting electromagnetic energy over a range of wavelengths and the signaling path includes one or more perturbances in transitioning from one wavelength to another wavelength along the signaling path. A series of triggering signals for input to a measurement system is generated by the semiconductor laser. The semiconductor laser also generates a series of ...

      Read Full Article
    7. Method and apparatus for processing the signal in spectral domain interferometry and method and apparatus for spectral domain optical coherence tomography

      Method and apparatus for processing the signal in spectral domain interferometry and method and apparatus for spectral domain optical coherence tomography

      Real-time depth measurements in sensing in spectral domain interferometry and for en-face and cross section image production in optical coherence tomography can operate without any need to linearize the data to maximize the output signal and achieve the theoretical depth resolution. Novel interferometry is disclosed, where parameters of a master interferometer dictate the results in a slave interferometer. The master interferometer can be the same measuring interferometer used in two stages. The master interferometer parameters are at least optical path difference (OPD) or the speed of variation of the OPD in the master interferometer. Coherence gated data are produced from ...

      Read Full Article
    8. Image registration, averaging, and compounding for high speed extended depth optical coherence tomography

      Image registration, averaging, and compounding for high speed extended depth optical coherence tomography

      An optical coherence tomography (OCT) system including a source of broadband optical radiation and a beamsplitter coupled to the source is provided. The beamsplitter divides the source radiation into a reference path and a sample path. The reference path includes an optical switch to switch the reference path between a first path having a first reference reflector at a first reference optical path length and a second path having a second reference reflector at a second reference optical path length, different from the first reference optical path length. The system further includes a beam combiner that mixes source radiation reflected ...

      Read Full Article
    9. Interferometry employing refractive index dispersion broadening of interference signals

      Interferometry employing refractive index dispersion broadening of interference signals

      An interferometry system includes: a light source, defining a coherence length, an interferometer configured to combine measurement and reference beams to form an output beam, where the interferometer includes a dispersion imbalance between measurement and reference paths large enough to produce a coherence envelope for the system having a width more than twice the coherence length; a phase modulation device configured to introduce a variable phase between the measurement and reference beams; a detector; imaging optics to direct the output beam to the detector and produce an image of the measurement surface; and an electronic processor electronically coupled to the ...

      Read Full Article
    10. Systems and methods for providing beam scan patterns for high speed doppler optical frequency domain imaging

      Systems and methods for providing beam scan patterns for high speed doppler optical frequency domain imaging

      An exemplary apparatus and/or an exemplary method can be provided using which, it is possible (e.g., with at least one first arrangement) to measure an amplitude and/or a phase of at least one electromagnetic radiation provided from a particular portion of a sample. Further, it is possible (e.g., using at least one second arrangement) to scan a location of the particular portion along a path from a first point of the sample to a second point of the sample. In addition, it is possible to control the scan (e.g., with the second arrangement) such that ...

      Read Full Article
    11. 3D laser coding in glass

      3D laser coding in glass

      This inventive method assures the authenticity of drugs or other valuable substances that reside within product containers, such as syringes. The method includes initially measuring the 3D topology of the glass surface while determining the distance to the glass surface. Thereafter, a desired 3D code is written below the glass surface with a pulsed laser system. The written 3D code is readable using optical coherence topography (OCT) or parallel optical coherence tomography (pOCT) to verify the authenticity of the product container. A system uses this method with a plurality of syringes held within a tray, and a writing apparatus that ...

      Read Full Article
    12. Surface emitting laser and optical coherence tomography apparatus

      Surface emitting laser and optical coherence tomography apparatus

      In order to provide a wavelength tunable surface emitting laser capable of improving a wavelength tuning efficiency, provided is a surface emitting laser, including: a first reflector; a semiconductor cavity including an active layer; and a second reflector, the first reflector, the semiconductor cavity, and the second reflector being formed in the stated order, a gap portion being formed between the first reflector and a semiconductor layer, a cavity length being tunable, in which the surface emitting laser has a high reflectivity structure formed between the gap portion and the semiconductor cavity, and an expression of "(.lamda./2).times.m ...

      Read Full Article
    13. Ophthalmic optical coherence tomography system and method for quick switching to realize anterior and posterior eye segments imaging

      Ophthalmic optical coherence tomography system and method for quick switching to realize anterior and posterior eye segments imaging

      An ophthalmic optical coherence tomography system and a method for quick switching to realize anterior and posterior eye segments imaging are provided, the system includes: an OCT interferometer primary module and a sample arm module, the OCT interferometer primary module includes an OCT light source, a fiber coupler, a reference arm, a detection module, an X-direction scanning unit, and a Y-direction scanning unit; the sample arm module includes an anterior eye segment imaging module and a posterior eye segment imaging module; the Y-direction scanning unit is rotatable; when the Y-direction scanning unit is at a first rotation angle, the Y-direction ...

      Read Full Article
    14. Wavelength swept light source

      Wavelength swept light source

      A wavelength swept light source includes a sawtooth waveform as a main waveform and an exponential component of the sawtooth waveform to the controlled voltage of the electro-optic deflector. The controlled voltage is controlled so that, as an oscillation wavelength to be swept is swept towards a longer wavelength side, a change rate of the oscillation wavelength is increased.

      Read Full Article
      Mentions: NTT
    15. Process, arrangements and systems for providing frequency domain imaging of a sample

      Process, arrangements and systems for providing frequency domain imaging of a sample

      Exemplary apparatus, arrangement and method can be provided for obtaining information associated with an anatomical structure or sample using optical microscopy. A radiation can include first electromagnetic radiation(s) directed to an anatomical sample and at least one second electromagnetic radiation directed to a reference. A wavelength of the radiation can vary over time, and the wavelength can be shorter than approximately 1150 nm. An interference can be detected between third and forth radiations associated with the first, second and fourth radiation, respectively. At least one image corresponding to portion(s) of the sample can be generated using data associated ...

      Read Full Article
    16. Method and device for recording and displaying an OCT whole-eye scan

      Method and device for recording and displaying an OCT whole-eye scan

      The eye is illuminated by a variable laser light source with a measurement range corresponding to the eye length, wherein the focus of the laser beam in the eye can be shifted laterally and/or axially by an adjustment mechanism, and the light fractions back-scattered from the sample are captured via an interferometer by a data acquisition unit and forwarded to a data processing unit. In the data processing unit, an OCT whole-eye scan is combined with at least one or several further overlapping tomographic part-eye or whole-eye scans. Reference information is used to register the first whole-eye scan with ...

      Read Full Article
    17. Integrated delay line for optical coherence tomography

      Integrated delay line for optical coherence tomography

      A system includes a waveguide that guides a beam of radiation, a variable delay unit, and a polarization-dependent modulating unit. The variable delay unit modulates the refractive index in a region, and the waveguide makes a plurality of passes through the region. The polarization-dependent element compensates for birefringence associated with the beam of radiation and includes a polarization splitter and a plurality of modulating elements. The polarization splitter has a first arm and a second arm that each include modulation segments. The beam of radiation is split between the first arm and the second arm and recombined after traversing the ...

      Read Full Article
    18. Optical coherence tomography device having a plurality of calibration reflecting surfaces

      Optical coherence tomography device having a plurality of calibration reflecting surfaces

      Provided is an optical tomographic device including a measurement optical system that irradiates light from a light source to inside a subject and guides reflected light therefrom; a reference optical system that guides the light from the light source as reference light; a calibration optical system that irradiates a calibration reflecting surface with light from the light source, and guides the reflected light reflected by the calibration reflecting surface; a light-receiving element that receives the interfering light for measurement formed by synthesizing the reflected light guided by the measurement optical system and the reference light, and the interfering light for ...

      Read Full Article
    19. Surface emitting laser and optical coherence tomography measuring apparatus using the surface emitting laser

      Surface emitting laser and optical coherence tomography measuring apparatus using the surface emitting laser

      A surface emitting laser operable to change a wavelength of emitted light includes a first reflecting mirror, a second reflecting mirror, wherein a cavity is formed between the first reflecting mirror and the second reflecting mirror along the optical axis of the surface emitting laser, an active layer formed within the cavity, a region formed within the cavity, and a movable part situated within the region, the movable part having a refractive index different from a refractive index of the region. The wavelength of emitted light is changeable by changing the position of the movable part along the direction of ...

      Read Full Article
    20. Optical-electrical rotary joint and methods of use

      Optical-electrical rotary joint and methods of use

      The present invention relates generally to rotatable optical couplings, and more particularly to a manually separable and re-connectable optical-electrical rotary joint. The invention provides a manually separable optical-electrical rotary joint in which an optical signal and electrical signal are transmitted while a downstream component rotates relative to an upstream component, for example, as driven by a motor at the upstream component. Further, the downstream component can be easily manually unplugged from the upstream component.

      Read Full Article
    21. Analysis and visualization of OCT angiography data

      Analysis and visualization of OCT angiography data

      Methods for analyzing and visualizing OCT angiography data are presented. In one embodiment, an automated method for identifying the foveal avascular zone in a two dimensional en face image generated from motion contrast data is presented. Several 3D visualization techniques are presented including one in which a particular vessel is selected in a motion contrast image and all connected vessels are highlighted. A further embodiment includes a stereoscopic visualization method. In addition, a variety of metrics for characterizing OCT angiography image data are described.

      Read Full Article
    22. Swept source optical coherence tomography and method for stabilizing phase thereof

      Swept source optical coherence tomography and method for stabilizing phase thereof

      In an embodiment, a computer 16, which generates tomographic images based on spectral interference signals detected by a light detector 15 from overlaid reference light emitted by a swept-source type light source 2 of a SS-OCT, split, and then reflected by a fixed reference mirror 8 on one hand and object light reflected by an object to be measured 6 on the other, is caused to function to apply rough correction using a first correction means and then apply detailed correction using a second correction means, to stabilize the phases of the SS-OCT. The phases can be stabilized by eliminating ...

      Read Full Article
    23. Method of processing optical coherence tomography images

      Method of processing optical coherence tomography images

      An automatic or semiautomatic method of processing intravascular Optical Coherence Tomography (OCT) images, comprising: pre-processing the primary image by segmenting the guidewire in the lumen to exclude it from the image, determining whether the lumen is open or closed; if the lumen is determined to be closed, performing a first automatic lumen segmentation procedure on the pre-processed image to define a perimeter line of the lumen, corresponding to the inner edge of the vessel wall, and determine a centroid CL of the lumen area; if the lumen is determined not to be closed, sequentially performing an automatic lumen closing procedure ...

      Read Full Article
    1-24 of 2094 1 2 3 4 ... 86 87 88 »
  1. Categories

    1. Applications:

      Art, Cardiology, Dentistry, Dermatology, Developmental Biology, Gastroenterology, Gynecology, Microscopy, NDE/NDT, Neurology, Oncology, Ophthalmology, Other Non-Medical, Otolaryngology, Pulmonology, Urology
    2. Business News:

      Acquisition, Clinical Trials, Funding, Other Business News, Partnership, Patents
    3. Technology:

      Broadband Sources, Probes, Tunable Sources
    4. Miscellaneous:

      Jobs & Studentships, Student Theses, Textbooks
  2. Popular Articles

  3. Organizations in the News

    1. (1 articles) UC Irvine
    2. (1 articles) University of Kent
    3. (1 articles) Duke University
    4. (1 articles) Massachusetts General Hospital
    5. (1 articles) Harvard University
  4. People in the News

    1. (2 articles) Alex E. Cable
    2. (2 articles) Vijay Jayaraman
    3. (1 articles) Guillermo J. Tearney
    4. (1 articles) Peter J. De Groot
    5. (1 articles) Brett E. Bouma
    6. (1 articles) Joseph A. Izatt
    7. (1 articles) Eric L. Buckland
    8. (1 articles) Al-Hafeez Dhalla
    9. (1 articles) Michael P. Minneman
    10. (1 articles) Mingtao Zhao
    11. (1 articles) Benjamin M. Potsaid
    12. (1 articles) Benjamin J. Vakoc
  5. OCT Companies in the News

    1. (2 articles) Thorlabs
    2. (2 articles) Praevium Research
    3. (1 articles) Zygo
    4. (1 articles) Bioptigen
    5. (1 articles) Canon Medical Systems
    6. (1 articles) Insight Photonic Solutions