1. Articles from jannick p. rolland

    49-59 of 59 « 1 2 3
    1. Dual detection full range frequency domain optical coherence tomography

      Dual detection full range frequency domain optical coherence tomography
      It has been shown that frequency domain optical coherence tomography (FD-OCT) systems achieve higher sensitivities compared to time domain optical coherence tomography (OCT) systems. However, the obscure object structure due to the mirror image generated by the Fourier transform is one of the remaining issues in the FD-OCT. We designed and developed what we believe to be a novel full range FD-OCT system that we refer to as the dual detection full range frequency domain optical coherence tomography (DD-FDOCT) that enables the instantaneous retrieval of quadrature components of the complex interferometric signal. The DD-FDOCT system enables full range imaging without ...
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    2. Perspectives of optical scanning in OCT

      Perspectives of optical scanning in OCT

      We present an overview of our contributions and directions of research in the domain of optical scanners, with regard to their perspectives of use in optical coherence tomography (OCT). The performances, advantages and drawbacks of the different types of scanning systems are summarized. Both 1-D and 2-D scanners for various applications in OCT, from swept source filters to flying the beam over the target are considered. We briefly present our developments of polygon mirror (PM) scanners. We study galvoscanners (GS) in order to increase their duty cycle in general and for high speed scanners in particular. The limitations in reaching ...

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    3. Gabor-based fusion technique for Optical Coherence Microscopy

      Gabor-based fusion technique for Optical Coherence Microscopy
      We recently reported on an Optical Coherence Microscopy technique, whose innovation intrinsically builds on a recently reported - 2 μm invariant lateral resolution by design throughout a 2 mm cubic full-field of view - liquid-lens-based dynamic focusing optical probe [Murali et al.,Optics Letters 34, 145-147, 2009]. We shall report in this paper on the image acquisition enabled by this optical probe when combined with an automatic data fusion method developed and described here to produce an in-focus high resolution image throughout the imaging depth of the sample. An African frog tadpole (Xenopus laevis) was imaged with the novel probe and the ...
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    4. Gabor domain optical coherence microscopy

      Gabor domain optical coherence microscopy
      In this paper, we present a developing technology targeted at clinical imaging, Gabor Domain Optical Coherence Microscopy (GD-OCM), which combines the high resolution imaging of optical coherence microscopy (OCM), high imaging speed of Fourier domain optical coherence tomography (FD-OCT), and invariant lateral resolution of our custom designed dynamic focusing objective. A high lateral resolution optical design of a dynamic-focusing optical probe with no moving parts, which provides an invariant resolution of currently < 3 µm across a 2mm full-field of view and 2mm imaging depth, is presented. Furthermore, an acquisition scheme (using the probe) that is capable of performing automatic real ...
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    5. Dual-reference full-range frequency domain optical coherence tomography

      Dual-reference full-range frequency domain optical coherence tomography
      It has been shown that frequency domain optical coherence tomography (FD-OCT) systems achieve higher sensitivities compared to time domain OCT systems. However, the obscure object structure due to the mirror image generated by the Fourier transform is one of the main problems in FD-OCT. We designed and developed a novel full range FD-OCT system that we refer to as the dual-reference full-range FD-OCT (DR-FDOCT) that enables doubling the imaging depth by removing mirror images generated from the Fourier transform of the detected real-valued spectra. The DR-FDOCT system enables full-range imaging without any loss of speed and is less sensitive to ...
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    6. Three-dimensional adaptive microscopy using embedded liquid lens

      Three-dimensional adaptive microscopy using embedded liquid lens
      We report on the compact optical design of a high-resolution 3D scanning microscope with adaptive optics capability for refocusing with no moving parts designed for clinical research. The optical aberrations arising from refocusing are compensated for as part of the multiconfiguration optical ... [Opt. Lett. 34, 145-147 (2009)]
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    7. Gabor domain optical coherence microscopy

      Gabor domain optical coherence microscopy
      Optical Coherence Microscopy (OCM) is an emerging technology capable of depth sectioning of biological tissue at the micrometer scale. In this paper, we propose a developing technology we call Gabor Domain Optical Coherence Microscopy (GD-OCM), whose innovation is two folds: (1) A high lateral resolution optical design of a dynamic-focusing optical probe with no moving parts, which provides an invariant resolution of currently 3 µm across a 2mm full-field of view and 2mm imaging depth by design; (2) An acquisition scheme (using the probe) that is capable of performing automatic data fusion to render an in-focus high resolution image throughout ...
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    8. Determination of the coherency matrix of a broadband stochastic electromagnetic light beam

      Determination of the coherency matrix of a broadband stochastic electromagnetic light beam

      The statistical ensemble of a fluctuating, statistically-stationary electromagnetic light beam is presented in terms of a 2 2 matrix, so-called coherency matrix. The method to determine such matrix for a quasi-monochromatic light beam has been proposed for many years. In this paper, we demonstrate that the method needs to be only slightly modified to determine the matrix elements of a broadband stochastic electromagnetic light beam, if one uses the representation of statistical wave fields in the space-frequency domain. The implementation of the method is demonstrated, and the coherency matrix measurement is validated using a well-defined elliptically polarized beam.

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    9. Bessel beam spectral-domain high-resolution optical coherence tomography with micro-optic axicon providing extended focusing range

      Bessel beam spectral-domain high-resolution optical coherence tomography with micro-optic axicon providing extended focusing range
      Endoscopic imaging in tubular structures, such as the tracheobronchial tree, could benefit from imaging optics with an extended depth of focus (DOF) to accommodate the varying sizes of tubular structures across patients and along the tree within the same patient. Yet the extended DOF needs to be accomplished without sacrificing resolution while maintaining sufficient sensitivity and speed of imaging. In this Letter, we report on the measured resolution and sensitivity achieved with a custom-made micro-optic axicon lens designed to theoretically achieve an 8 mm DOF. A measured invariant resolution of 8 m is demonstrated across a 4 mm measured DOF ...
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    10. Three dimensional optical imaging colposcopy

      Three dimensional optical imaging colposcopy
      An optical coherence tomography (OCT) and spectral interferometry imaging probe for the automatic screening and diagnosis of cervical and skin cancer in vivo. The probe eliminates the old techniques of having to perform Pap smears followed by a biopsy, known as colposcopy. The novel probe is cylindrical in shape and has a disposable outer plastic shield. Inside the probe is a motor driven rotatable casing having a planar optical fiber bundle array therein. The fiber bundle array has plastic light coupling lenslet arrays on both ends. The exposed end of the probe has one lenslet array disc that couples light ...
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    11. Optical disk readout method using optical coherence tomography and spectral interferometry

      Optical disk readout method using optical coherence tomography and spectral interferometry
      An optical coherence tomography (OCT) and spectral interferometry imaging probe for the automatic screening and diagnosis of cervical and skin cancer in vivo. The probe eliminates the old techniques of having to perform Pap smears followed by a biopsy, known as colposcopy. The novel probe is cylindrical in shape and has a disposable outer plastic shield. Inside the probe is a motor driven rotatable casing having a planar optical fiber bundle array therein. The fiber bundle array has plastic light coupling lenslet arrays on both ends. The exposed end of the probe has one lenslet array disc that couples light ...
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    49-59 of 59 « 1 2 3
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  2. Topics in the News

    1. (59 articles) Jannick P. Rolland
    2. (52 articles) University of Rochester
    3. (23 articles) Kye-Sung Lee
    4. (22 articles) Panomsak Meemon
    5. (15 articles) University of Central Florida
    6. (10 articles) Kevin P. Thompson
    7. (7 articles) University of Arizona
    8. (7 articles) Optical Research Associates
    9. (6 articles) Supraja Murali
    10. (4 articles) UCLA
    11. (1 articles) Institute of Applied Physics
    12. (1 articles) Xincheng Yao
    13. (1 articles) Grigory V. Gelikonov
    14. (1 articles) Gereon Hüttmann
    15. (1 articles) Pavel A. Shilyagin
    16. (1 articles) Hendrik Spahr
    17. (1 articles) Thorlabs
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    Three dimensional optical imaging colposcopy Optical disk readout method using optical coherence tomography and spectral interferometry Dual-reference full-range frequency domain optical coherence tomography Gabor domain optical coherence microscopy Gabor-based fusion technique for Optical Coherence Microscopy Perspectives of optical scanning in OCT Dual detection full range frequency domain optical coherence tomography Assessment of a liquid lens enabled in vivo optical coherence microscope Broadband astigmatism-corrected 
Czerny–Turner spectrometer Broadband Fourier-domain mode-locked lasers Postdoctoral opening in optical instrumentation and retinal imaging at University of Illinois at Chicago Detection of intracranial hypertension in children using optical coherence tomography: a systematic review protocol