1. Ryerson University

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    1. Mentioned In 92 Articles

    2. Simultaneous 6-channel optical coherence tomography using a high-power telescope-less polygon-based swept laser in dual amplifier configuration

      Simultaneous 6-channel optical coherence tomography using a high-power telescope-less polygon-based swept laser in dual amplifier configuration
      Multichannel optical coherence tomography (MOCT) imaging is demonstrated using a high-power wavelength-swept laser source. The main benefit of MOCT is faster image acquisition rates without a corresponding increase in the laser tuning speed. The wavelength-swept laser was constructed using a compact telescope-less polygon-based filter in Littman arrangement. High output power, necessary for MOCT, was achieved by incorporating two serial semiconductor optical amplifiers in a ring laser cavity in Fourier domain ...
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    3. Feature Of The Week 2/28/10: Multichannel optical coherence tomography using a high-power telescope-less polygon-based swept laser in dual-amplifier configuration

      Feature Of The Week 2/28/10: Multichannel optical coherence tomography using a high-power telescope-less polygon-based swept laser in dual-amplifier configuration
      ... rodents. Feature Of The Week 2/28/10: Researchers at the University of Toronto, Ontario Cancer Institute and Ryerson University have been actively advancing Optical Coherence Tomography (OCT) in several areas, including...
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    4. In situ 24 kHz coherent imaging of morphology change in laser percussion drilling

      In situ 24 kHz coherent imaging of morphology change in laser percussion drilling
      We observe sample morphology changes in real time 24 kHz during and between percussion drilling pulses by integrating a low-coherence microscope into a laser micromachining platform. Nonuniform cut speed and sidewall evolution in stainless steel are observed to strongly depend on assist gas. Interpulse morphology relaxation such as hole refill is directly imaged, showing dramatic differences in the material removal process dependent on pulse duration/peak power (s/0.1 ...
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    5. Developing dual core ytterbium doped fiber ring laser in Fourier domain mode locked operation for swept-source optical coherence tomography

      Developing dual core ytterbium doped fiber ring laser in Fourier domain mode locked operation for swept-source optical coherence tomography
      We demonstrate high efficiency and wide bandwidth gain in a Ytterbium doped fiber amplifier. The highpowered amplifier has potential applications for use with a swept-source fiber ring laser in multi-channel optical coherence tomography (OCT) system. The ring cavity design includes a 976nm pumped dual core Yb doped fiber as the gain medium, where a rotating polygon mirror is used as a wavelength-sweeping filter for this source. The amplified spontaneous emission ...
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    6. Cascaded Raman fiber laser in Fourier domain mode lock operation

      Cascaded Raman fiber laser in Fourier domain mode lock operation
      In this study, a cascaded Raman fiber laser in Fourier domain mode lock operation (FDML) is presented. This laser utilizes a Ytterbium doped twin core pump laser source at 1109 nm. The pump light is directed to a cascaded Raman cavity, which consists of multiple cascaded fiber Bragg grating pairs and 3.86 km of dispersion compensation fiber, which provides Raman gain. The output wavelength of a cascaded Raman laser ...
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    7. Wavelength-swept spectral and pulse shaping utilizing hybrid Fourier domain modelocking by fiber optical parametric and erbium-doped fiber amplifiers

      Wavelength-swept spectral and pulse shaping utilizing hybrid Fourier domain modelocking by fiber optical parametric and erbium-doped fiber amplifiers
      We report the first Fourier domain modelocked (FDML) laser constructed using optical parametric amplifier (OPA) in conjunction with an erbium-doped fiber amplifier (EDFA), centered at ~1555nm, to the best of our knowledge. We utilize a one-pump OPA and a C-band EDFA in serial configuration with a tunable Fabry-Perot interferometer to generate a hybrid FDML spectrum. Results demonstrate a substantially better spectral shape, output power and stability than individual configurations, with ...
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    8. High-power wavelength-swept laser in Littman telescope-less polygon filter and dual-amplifier configuration for multichannel optical coherence tomography

      High-power wavelength-swept laser in Littman telescope-less polygon filter and dual-amplifier configuration for multichannel optical coherence tomography
      We report a high-power wavelength-swept laser source for multichannel optical coherence tomography (OCT) imaging. Wavelength tuning is performed by a compact telescope-less polygon-based filter in Littman arrangement. High output power is achieved by incorporating two serial semiconductor optical amplifiers in the laser cavity in Fourier domain mode-locked configuration. The measured wavelength tuning range of the laser is 111 nm centered at 1329 nm, coherence length of 5.5 mm, and ...
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    9. Interstitial Doppler Optical Coherence Tomography as a Local Tumor Necrosis Predictor in Photodynamic Therapy of Prostatic Carcinoma: An In vivo Study

      ...onto, 3 Ontario Cancer Institute/University Health Network, 4 Department Electrical and Computer Engineering, Ryerson University, and 5 Imaging Research, Sunnybrook Health Sciences Center, Toronto, Canada Requests for re...
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    10. Multiple beams boost resolution of OCT

      Multiple beams boost resolution of OCT
      Optical coherence tomography (OCT), a powerful cross-sectional modality allowing noninvasive imaging of samples in real time and at high resolution, has become the new gold standard in ophthalmic care. But while it is extremely promising for other clinical applications, its use in those areas is not widespread. That is due at least in part to technical constraints, which equipment makers are addressing. One approach, multibeam OCT, promises to advance the ...
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    11. High power wavelength linearly swept mode locked fiber laser for OCT imaging

      We report a long coherence length, high power, and wide tuning range wavelength linearly swept fiber mode-locked laser based on polygon scanning filters. An output power of 52.6 mW with 112 nm wavelength tuning range at 62.6 kHz sweeping rate has been achieved. The coherence length is long enough ... [Opt. Express 16, 14095-14105 (2008)]
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    12. Speckle variance detection of microvasculature using swept-source optical coherence tomography

      Speckle variance detection of microvasculature using swept-source optical coherence tomography
      Adrian Mariampillai, Beau A. Standish, Eduardo H. Moriyama, Mamta Khurana, Nigel R. Munce, Michael K. Leung, James Jiang, Alex Cable, Brian C. Wilson, I. Alex Vitkin, Victor X. Yang. We report on imaging of microcirculation by calculating the speckle variance of optical coherence tomography (OCT) structural images acquired using a Fourier domain mode-locked swept-wavelength laser. The algorithm calculates interframe speckle variance in two-dimensional and three-dimensional OCT ... [Opt. Lett. 33, 1530-1532 ...
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    13. Electrostatic forward-viewing scanning probe for Doppler optical coherence tomography using a dissipative polymer catheter

      Nigel R. Munce, Adrian Mariampillai, Beau A. Standish, Mihaela Pop, Kevan J. Anderson, George Y. Liu, Tim Luk, Brian K. Courtney, Graham A. Wright, I. Alex Vitkin, Victor X. D. Yang. A novel flexible scanning optical probe is constructed with a finely etched optical fiber strung through a platinum coil in the lumen of a dissipative polymer. The packaged probe is 2.2mm in diameter with a rigid length of ...
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    14. 76-92 of 92 « 1 2 3 4 5 6
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  2. About Ryerson University

    Ryerson University

    Ryerson University is Canada’s leader in innovative, career-focused education and a university clearly on the move. It is a distinctly urban university with a mission to serve societal need, and a long-standing commitment to engaging its community. Guided by a bold new Academic Plan, an ambitious research agenda, and a recently-completed Master Plan to revitalize the campus and surrounding neighbourhood, Ryerson is now the most applied-to university in Ontario relative to available spaces, and its reputation with business and community leaders continues to rise. In just a few years since the introduction of its first master's program, Ryerson has grown to host 2,000 graduate students in 34 programs, including nine at the doctoral level. The University now ranks third in Canada - and first in Ontario - in terms of research growth. And Ryerson is reshaping the downtown core of Toronto with two new buildings: a Photography Gallery and Research Centre in the heart of campus, and a Student Learning Centre on the site of the iconic Sam the Record Man property on Yonge Street, in the heart of the city. Since 1948, Ryerson has built its reputation on the strength of its academic curriculum, and offers close to 100 PhD, master's, and undergraduate programs, with a total enrolment of 25,000 and more than 65,000 registrations annually in The G. Raymond Chang School of Continuing Education.