1. James M. Fraser

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    1. Mentioned In 7 Articles

    2. Methods and systems for coherent imaging and feedback control for modification of materials

      Methods and systems for coherent imaging and feedback control for modification of materials
      Methods and systems are provided for using optical interferometry in the context of material modification processes such as surgical laser or welding applications. An imaging optical source that produces imaging light. A feedback controller controls at least one processing parameter of the material modification process based on an interferometry output generated using the imaging light. A method of processing interferograms is provided based on homodyne filtering. A method of generating ...
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    3. Scientists create laser similar to Star Wars light sabre

      Scientists create laser similar to Star Wars light sabre
      A team of medical and physics experts developed a groundbreaking technique that significantly improves laser accuracy to the point where cutting can be controlled to stop at a precise point — comparable to the idea of a Star Wars light sabre. Specifically, the team has demonstrated that they can stop the laser within 50 microns — or half the diameter of a human hair. “A major problem that’s really hindering laser ...
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    4. Real-time guidance of thermal and ultrashort pulsed laser ablation in hard tissue using inline coherent imaging

      Real-time guidance of thermal and ultrashort pulsed laser ablation in hard tissue using inline coherent imaging
      Abstract Background and Objective During tissue ablation, laser light can be delivered with high precision in the transverse dimensions but final incision depth can be difficult to control. We monitor incision depth as it progresses, providing feedback to ensure that material removal occurs within a localized target volume, reducing the possibility of undesirable damage to tissues below the incision. Materials and Methods Ex vivo cortical and cancellous bone was ablated ...
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    5. Time-gated Fourier-domain optical coherence tomography

      A novel optical coherence tomography (OCT) system is presented that combines Fourier-domain OCT with incoherent nonlinear time gating. By processing backscattered light in the optical domain, the user can select a restricted depth field of view for improved contrast and acquisition speed. This ... [Opt. Lett. 32, 3336-3338 (2007)]
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    6. High speed in situ depth profiling of ultrafast micromachining

      We demonstrate real-time depth profiling of ultrafast micromachining of stainless steel at scan rates of 46 kHz. The broad bandwidth and high power of the light source allows for simultaneous machining and coaxial Fourier-domain interferometric imaging of the ablation surface with depth resolutions ... [Opt. Express 15, 14967-14972 (2007)]
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  2. About James M. Fraser

    James M. Fraser

    James M. Fraser is an assistant professor in the department of Physics, Engineering Physics & Astronomy at Queen's University in Canada.