1. Articles in category: Tunable Sources

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    1. Wavelength-tunable vertical cavity surface emitting laser for swept source optical coherence tomography system

      Wavelength-tunable vertical cavity surface emitting laser for swept source optical coherence tomography system

      A wavelength-tunable vertical-cavity surface-emitting laser (VCSEL) with the use of microelectromechanical system (MEMS) technology is provided as a swept source for Optical Coherence Tomography (OCT). The wavelength-tunable VCSEL comprises a bottom mirror of the VCSEL, an active region, and a MEMS tunable upper mirror movable by electrostatic deflections. The bottom mirror comprising a GaAs based distributed Bragg reflector (DBR) stack, and the active region comprising multiple stacks of GaAs based quantum dot (QD) layers, are epitaxially grown on a GaAs substrate. The MEMS tunable upper mirror includes a membrane part supported by suspension beams, and an upper mirror comprising a ...

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      Mentions: InPhenix
    2. A New Component Toolbox For 2 Micron Fiber Lasers

      A New Component Toolbox For 2 Micron Fiber Lasers

      Gooch & Housego now offers a full suite of passive and active components to enable high power, all-fiber laser systems at 2 µm for use in materials processing, surgery and sensing. Developed over three years during the ISLA project (Integrated disruptive components for 2 µm fiber Lasers), the components draw on G&H core competencies in design and manufacturing of fused fiber components and acousto-optic devices. Fiber lasers have become a workhorse in material processing, where they are valued for their high power, low maintenance, and the convenience of routing light directly to the sample. Most existing fiber lasers operate at ...

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      Mentions: Gooch & Housego
    3. System and method for generating and utilizing sample trigger blanking to obviate spurious data and increase sweep rate in an akinetic path-based swept laser

      System and method for generating and utilizing sample trigger blanking 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 are generated for input to a measurement system by the semiconductor laser. The series of triggering signals include a non-uniform ...

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    4. New lasers offer low cost industrial processing and novel surgical possibilities

      New lasers offer low cost industrial processing and novel surgical possibilities

      EU scientists have developed efficient new fibre optic lasers that deliver short wavelengths for accurate polymer material processing, at incredible strength and low cost. The consortium behind the new innovations, developed through the ISLA project, is now in the process of marketing some of these cutting edge devices.

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    5. VECSELs: Innovative light sources for PDT - Photodiagnosis and Photodynamic Therapy

      VECSELs: Innovative light sources for PDT - Photodiagnosis and Photodynamic Therapy

      Photodynamic therapy (PDT) with porphyrins and red light (610–630 nm) is finding increasing clinical application for both the eradication of relatively small tumors and the palliation of inoperable or obstructive tumors. PDT also shows some promise for the sterilization of the tumor bed after surgical removal of neoplastic masses. Optically pumped vertical external-cavity surface-emitting lasers (VECSELs) appear to be a very innovative and efficient technology in this specific wavelength range. Furthermore, VECSELs are power scalable and wavelength tunable, and are an appealing light source for PDT.

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      Mentions: Mircea Guina
    6. Device, light source device, and imaging apparatus using the same

      Device, light source device, and imaging apparatus using the same

      A device includes a first resonating cavity and a second resonating cavity. The first resonating cavity includes a first end surface and a second end surface. The first resonating cavity has a first free spectral range. The first free spectral range is a first frequency of a wavelength dependent ripple in a gain of the device that is a function of a first distance between the first end surface and the second end surface. The second resonating cavity includes a third end surface and a fourth end surface. A second distance between the third end surface and the fourth end ...

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    7. Self-sweeping laser could dramatically shrink 3-D mapping systems

      Self-sweeping laser could dramatically shrink 3-D mapping systems

      A new approach that uses light to move mirrors could usher in a new generation of laser technology for a wide range of applications, including remote sensing, self-driving car navigation and 3D biomedical imaging. A team of University of California, Berkeley, engineers led by Connie Chang-Hasnain, a professor of electrical engineering and computer sciences, used a novel concept to automate the way a light source changes its wavelength as it sweeps the surrounding landscape. They report their findings in the journal Scientific Reports , to be published Thursday, Sept. 3. The advance could have implications for imaging technology using LIDAR, or ...

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    8. Laser optomechanics

      Laser optomechanics

      Cavity optomechanics explores the interaction between optical field and mechanical motion. So far, this interaction has relied on the detuning between a passive optical resonator and an external pump laser. Here, we report a new scheme with mutual coupling between a mechanical oscillator supporting the mirror of a laser and the optical field generated by the laser itself. The optically active cavity greatly enhances the light-matter energy transfer. In this work, we use an electrically-pumped vertical-cavity surface-emitting laser (VCSEL) with an ultra-light-weight (130 pg) high-contrast-grating (HCG) mirror, whose reflectivity spectrum is designed to facilitate strong optomechanical coupling, to demonstrate optomechanically-induced ...

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    9. System and method for generating and utilizing a valid sweep vector 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 vector 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 are generated for input to a measurement system by the semiconductor laser. The electromagnetic energy output from the semiconductor laser ...

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    10. Swept-Source OCT: Patent License Agreement between Massachusetts General Hospital and Heidelberg Engineering

      Swept-Source OCT: Patent License Agreement between Massachusetts General Hospital and Heidelberg Engineering

      Heidelberg Engineering has entered into a patent license agreement with Massachusetts General Hospital (MGH) in Boston. The agreement grants global and exclusive rights to 77 basic patents and patent applications which relate to swept-source OCT technology and its application in ophthalmology. Spectral domain OCT has become indispensable to eye care professionals worldwide to diagnose and follow-up patients with diseases of the posterior segment of the eye, such as age-related macular degeneration, diabetic retinopathy, or glaucoma. Swept-source OCT technology has specific characteristics which are ideal to acquire comprehensive information about a wide variety of properties of the anterior part of the ...

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    11. Scanning Laser Ophthalmoscopes

      Scanning Laser Ophthalmoscopes

      A scanning laser ophthalmoscope (SLO) for imaging the retina of an eye comprises a source ( 12 ) of collimated light, a scanning device ( 14, 16, 1328, 1319 ), a scan transfer device ( 20 ) and a detector ( 1310 ). The scan transfer device has a first focus ( 16 ) at which an apparent point source is provided and a second focus ( 24 ) at which an eye ( 524, 1324 ) may be accommodated. The scan transfer device transfers a two-dimensional collimated light scan from the apparent point source into the eye. An optical coherence tomography (OCT) system ( 900 ) is combined with the SLO, the OCT system providing ...

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    12. Wavelength shifting of intra-cavity photons: Adiabatic wavelength tuning in rapidly wavelength-swept lasers

      Wavelength shifting of intra-cavity photons: Adiabatic wavelength tuning in rapidly wavelength-swept lasers

      We analyze the physics behind the newest generation of rapidly wavelength tunable sources for optical coherence tomography (OCT), retaining a single longitudinal cavity mode during operation without repeated build up of lasing. In this context, we theoretically investigate the currently existing concepts of rapidly wavelength-swept lasers based on tuning of the cavity length or refractive index, leading to an altered optical path length inside the resonator. Specifically, we consider vertical-cavity surface-emitting lasers (VCSELs) with microelectromechanical system (MEMS) mirrors as well as Fourier domain mode-locked (FDML) and Vernier-tuned distributed Bragg reflector (VT-DBR) lasers. Based on heuristic arguments and exact analytical solutions ...

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    13. Vertical-cavity surface-emitting laser and method of fabricating the same

      Vertical-cavity surface-emitting laser and method of fabricating the same

      Provided are a wavelength swept vertical-cavity surface-emitting laser and a method of fabricating the same. The laser may include a substrate, a lower reflection layer on the substrate, an active layer on the lower reflection layer, a sacrificial layer disposed on a first side of the active layer, a stopper disposed on a second side of the active layer that may be spaced apart from the sacrificial layer, and an upper reflection layer fixed on the sacrificial layer, the upper reflection layer extending over the stopper and the active layer. The stopper defines a minimum separation distance between the upper ...

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    14. Device for swept source optical coherence domain reflectometry

      Device for swept source optical coherence domain reflectometry

      A device for swept-source optical coherence domain reflectometry (SS OCDR) on moveable samples, particularly human eyes, for obtaining A-scans, having a measuring range according to the sample length and having a laser light source which can be adjusted by a main wave number k.sub.0 and at least one receiver for the light dissipated from the sample, wherein the sample is illuminated on the sample surface by a measurement beam having a diameter D by way of a coupling device. The light source has a spectral line width of .delta.k<168 m.sup.-1 and the adjustment of ...

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    15. Tunable Surface Emitting Laser, Manufacturing Method Thereof, And Optical Coherence Tomography Apparatus Including Tunable Surface Emitting Laser

      Tunable Surface Emitting Laser, Manufacturing Method Thereof, And Optical Coherence Tomography Apparatus Including Tunable Surface Emitting Laser

      (EN) A tunable surface emitting laser includes on a semiconductor substrate (1) a first reflecting mirror (2); an active layer (4) on the first reflecting mirror which may be a DBR; a current confinement layer (6) resulting from partial oxidation of an AlGaAs layer; a conductive layer (7) on the current confinement layer (6) for providing a bias current to the active region; support portions (8) made from electrically insulating material like undoped GaAs; and a conductive film (9) which is provided above the conductive layer via a support portion (8) and which comprises a second reflecting mirror (11) like ...

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    16. High-speed En Face Optical Coherence Tomography Measurement System Developed

      High-speed En Face Optical Coherence Tomography Measurement System Developed

      A group of researchers led by OHMI Masato (Professor, Graduate School of Medicine, Osaka University) succeeded in developing a high-speed en face optical coherence tomography measurement system (en face OCT) that uses a function as optical deflector of crystals of potassium tantalate niobate (KTN). KTN crystal is expected to be used for optical deflectors and variable focusing lens developed by the Nippon Telegraph and Telephone Public Corporation (NTT). This group paid attention to KTN's feature as a deflector capable of high-speed control of laser beam angle according to applied pressure. The group used that feature for OCT technology, and ...

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      Mentions: Osaka University
    17. System and method for optimization of coherence length of tunable laser sources

      System and method for optimization of coherence length of tunable laser sources

      A system and method for adjusting the coherence length of a tunable laser to optimize measurements and reduce artifacts. A tuning element of the laser system modulates, adjusts, or controls parameters associate with the tunable laser, such that the output wavelength of the tunable laser is modulated or adjusted over a wavelength range within a time interval. Modulation of the parameter has the effect of increasing a linewidth of the tunable laser.

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    18. 4D optical coherence tomography-based micro-angiography achieved by 1.6-MHz FDML swept source

      4D optical coherence tomography-based micro-angiography achieved by 1.6-MHz FDML swept source

      We demonstrate the use of an ultra-high-speed swept-source optical coherence tomography (OCT) to achieve optical micro-angiography (OMAG) of microcirculatory tissue beds in vivo . The system is based on a 1310-nm Fourier domain mode-locking (FDML) laser with 1.6-MHz A-line rate, providing a frame rate of 3.415 KHz, an axial resolution of ∼ 10     μ m and signal to noise ratio of 102 dB. Motion from blood flow causes change in OCT signals between consecutive B-frames acquired at the same location. Intensity-based inter-frame subtraction algorithm is applied to extract blood flow from tissue background without any motion correction. We demonstrate the capability ...

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    19. System and method for stabilizing mode locked swept laser for OCT medical imaging

      System and method for stabilizing mode locked swept laser for OCT medical imaging

      An optical coherence analysis system uses a laser swept source that is constrained to operate in a stable mode locked condition by modulating a drive current to the semiconductor optical amplifier as function of wavelength or synchronously with the drive voltage of the laser's tunable element based on stability map for the laser.

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    20. Ultrahigh-speed optical coherence tomography utilizing all-optical 40 MHz swept-source

      Ultrahigh-speed optical coherence tomography utilizing all-optical 40 MHz swept-source

      We present an ultrahigh-speed optical coherence tomography (OCT) based on an all-optical swept-source with an A-scan rate of 40 MHz. The inertia-free swept-source, which has its output power of 41.2 mW and tuning range of 40 nm and high scan linearity in wavenumber with Pearson’s correlation coefficients r of 0.9996, consists of a supercontinuum laser, an optical band-pass filter, a linearly chirped fiber Bragg grating, an erbium-doped fiber amplifier, and two buffer stages. With sensitivity of 87 dB, high-speed OCT imaging of biological tissue in vivo is also demonstrated.

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    21. Phase evolution and instantaneous linewidth of a Fourier domain mode locked laser

      Phase evolution and instantaneous linewidth of a Fourier domain mode locked laser

      An experimental and theoretical analysis of the dynamics of a Fourier domain mode locked laser, currently one of the fastest swept source lasers applied in optical coherence tomography, is performed. A novel time- resolved technique to measure the laser output electric field allows access to the phase dynamics of the laser and thus the coherence properties. A delay-differential equation model for the laser is used to analyse the system theoretically and via direct simulation. Numerical simulations of the laser output are in excellent agreement with experimentally measured data

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    22. System and method for generating an optimum side-mode suppression ratio continuous tuning path for a semiconductor tunable laser

      System and method for generating an optimum side-mode suppression ratio continuous tuning path for a semiconductor tunable laser

      A system and method to determine data sets of front mirror current, back mirror current and phase current that change the wavelength output by a semiconductor laser in a prescribed trajectory versus time, while maintaining the maximum side-mode suppression ratio at each point during the sweep.

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    23. Wavelength sweeping light source and imaging apparatus using the same

      Wavelength sweeping light source and imaging apparatus using the same

      A light source apparatus includes a laser oscillator equipped with a first optical resonator, a plurality of second optical resonators including input portions respectively connected in parallel to the first optical resonator, a plurality of light extraction units configured to extract a light beam from an output portion of each second optical resonator, and a light multiplexing unit configured to multiplex the light beam extracted from each light extraction unit, wherein the light source apparatus causes the light multiplexing unit to output a multiplexed light beam passed through the plurality of second optical resonators, an optical member having refractive index ...

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    1-24 of 309 1 2 3 4 ... 11 12 13 »
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