Journal ArticleDOI
Performances of endoscopic holography with a multicore optical fiber
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TLDR
A holographic setup that involves the use of a multicore optical fiber as an in situ recording medium and a CCD camera for electronic processing, providing more flexibility to the holographic process has been developed.Abstract:
A holographic setup that involves the use of a multicore optical fiber as an in situ recording medium has been developed. The hologram is transmitted to a CCD camera for electronic processing, and the image is reconstructed numerically, providing more flexibility to the holographic process. The performances of this imaging system have been evaluated in terms of the resolution limit and robustness relative to noise. The experimental cutoff frequency has been measured experimentally over a range of observation distances (4–10 mm) and presents a very good agreement with the predictions made by simulation. The system features a resolution of 5-μm objects for a 4-mm observation distance. The different sources of noise have been analyzed, and their influence on resolution has been proved to be nonrelevant.read more
Citations
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Journal ArticleDOI
Simultaneous amplitude-contrast and quantitative phase-contrast microscopy by numerical reconstruction of Fresnel off-axis holograms
TL;DR: Off-axis holograms recorded with a magnified image of microscopic objects are numerically reconstructed in amplitude and phase by calculation of scalar diffraction in the Fresnel approximation to show that the transverse resolution is equal to the diffraction limit of the imaging system.
Journal ArticleDOI
Spatial filtering for zero-order and twin-image elimination in digital off-axis holography
TL;DR: Off-axis holograms recorded with a CCD camera are numerically reconstructed with a calculation of scalar diffraction in the Fresnel approximation and the zero order of diffraction and the twin image are digitally eliminated by means of filtering their associated spatial frequencies in the computed Fourier transform of the hologram.
Journal ArticleDOI
Suppression of the zero-order term in off-axis digital holography through nonlinear filtering
TL;DR: Experimental validation of a new reconstruction method for off-axis digital holographic microscopy that effectively suppresses the object autocorrelation, namely, the zero-order term, from holographic data, thereby improving the reconstruction bandwidth of complex wavefronts.
Journal ArticleDOI
Review of quantitative phase-digital holographic microscopy: promising novel imaging technique to resolve neuronal network activity and identify cellular biomarkers of psychiatric disorders
Pierre Marquet,Pierre Marquet,Christian Depeursinge,Christian Depeursinge,Pierre J. Magistretti,Pierre J. Magistretti,Pierre J. Magistretti +6 more
TL;DR: Current and potential applications of QPM related to psychiatry through the identification of new and original cell biomarkers that, when combined with a range of other biomarkers, could significantly contribute to the determination of high risk developmental trajectories for psychiatric disorders are discussed.
Journal ArticleDOI
Aperture apodization using cubic spline interpolation: application in digital holographic microscopy
TL;DR: In this article, a method for designing apodized apertures with a transmission profile which follows a curve defined using a cubic spline interpolation is proposed for digital holographic microscopy to perform digitally apodization of the aperture of holograms recorded by a CCD camera.
References
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Journal ArticleDOI
Direct recording of holograms by a CCD target and numerical reconstruction.
Ulf Schnars,W. Jüptner +1 more
TL;DR: The principle of recording holograms directly on a CCD target is described and a real image of the object is reconstructed from the digitally sampled hologram by means of numerical methods.
Book
Principles of holography
TL;DR: Bargaining with reading habit is no need as discussed by the authors, reading is not kind of something sold that you can take or not, it is a thing that will change your life to life better.
Journal ArticleDOI
Fourier-transform holographic microscope
Waleed S. Haddad,David Cullen,Johndale C. Solem,James W. Longworth,Armon McPherson,Keith Boyer,Charles K. Rhodes +6 more
TL;DR: A holographic microscope with a spatial resolution approaching the diffraction limit and two unique capabilities that can collect three-dimensional information in a single pulse of light, avoiding specimen damage and bleaching is described.
Journal ArticleDOI
Statistical-mode sensor for fiber optic vibration sensing uses.
TL;DR: A method of sensing vibration using the detection of changes in the spatial distribution of energy in the output of a multimode optical fiber has been demonstrated and a mathematical model has been developed which has shown good agreement with observed sensor behavior.
Journal ArticleDOI
Imaging through scattering media with holography
Emmett N. Leith,Chao-Long Chen,H. Chen,Yi Chen,David S. Dilworth,Joaquin Lopez,James Van Rudd,P. C. Sun,Janis A. Valdmanis,Gerald L. Vossler +9 more
TL;DR: In this paper, various holographic methods for imaging through scattering media such as biological tissue are described, and the methods utilize light of either reduced spatial coherence or reduced temporal coherence.
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Simultaneous amplitude-contrast and quantitative phase-contrast microscopy by numerical reconstruction of Fresnel off-axis holograms
Direct recording of holograms by a CCD target and numerical reconstruction.
Ulf Schnars,W. Jüptner +1 more