Journal ArticleDOI
Compensation of the inherent wave front curvature in digital holographic coherent microscopy for quantitative phase-contrast imaging
Pietro Ferraro,Sergio De Nicola,Andrea Finizio,Giuseppe Coppola,Simonetta Grilli,Carlo Magro,Giovanni Pierattini +6 more
TLDR
An approach is proposed for removing the wavefront curvature introduced by the microscope imaging objective in digital holography, which otherwise hinders the phase contrast imaging at reconstruction planes and it is shown that a correction effect can be obtained at all reconstruction planes.Abstract:
An approach is proposed for removing the wave front curvature introduced by the microscope imaging objective in digital holography, which otherwise hinders the phase contrast imaging at reconstruction planes. The unwanted curvature is compensated by evaluating a correcting wave front at the hologram plane with no need for knowledge of the optical parameters, focal length of the imaging lens, or distances in the setup. Most importantly it is shown that a correction effect can be obtained at all reconstruction planes. Three different methods have been applied to evaluate the correction wave front and the methods are discussed in detail. The proposed approach is demonstrated by applying digital holography as a method of coherent microscopy for imaging amplitude and phase contrast of microstructures.read more
Citations
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Proceedings ArticleDOI
MEMS inspection by Digital Holographic
TL;DR: In this paper, the effect of a thermal load on the profile of cantilever beams has been evaluated using a Digital Holographic Microscope (DHM) and the measured profiles can be employed for a quantitative estimation of the residual stresses by mean of analytical and numerical models.
Book ChapterDOI
Unlabeled Semen Analysis by Means of the Holographic Imaging
TL;DR: The aim of this chapter is to show its high potentiality as an efficient method for healthy and fertile sperm cell selection, without injuring the specimen, and to explore new possible applications of digital holography in this field.
Journal ArticleDOI
Development and Characterization of a Dispersion-Encoded Method for Low-Coherence Interferometry
TL;DR: In this article, an extension to conventional low-coherence interferometry by the introduction of dispersion-encoding is discussed, which facilitates the measurement of surface height profiles with sub-nm resolution.
Journal ArticleDOI
Real-time holographic quantitative measurement of vapor density distribution of suspended droplets.
TL;DR: Digital holography technology is applied in a quantitative measurement of the density distribution of a low refractive index transparent substance (e.g., the vapor of suspended droplets) and it is believed that all the benefits make the setup a good choice for application in the Chinese space station.
Proceedings ArticleDOI
Learning end-to-end phase retrieval using only one interferogram with mixed-context network
TL;DR: This paper introduces a new loss function, called bucket error rate (BER), for addressing the problem of imbalanced data distribution by balancing loss-bias of target and background area adaptively and presents a novel mixed-context network (MCN) which can simultaneously aggregate local- and global-contextual information.
References
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Journal ArticleDOI
Phase-shifting digital holography
Ichirou Yamaguchi,Tong Zhang +1 more
TL;DR: A new method is proposed in which the distribution of complex amplitude at a plane is measured by phase-shifting interferometry and then Fresnel transformed by a digital computer, which can reconstruct an arbitrary cross section of a three-dimensional object with higher image quality and a wider viewing angle than from conventional digital holography using an off-axis configuration.
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.
Journal ArticleDOI
Digital holography for quantitative phase-contrast imaging.
TL;DR: A new application of digital holography for phase-contrast imaging and optical metrology and an application to surface profilometry shows excellent agreement with contact-stylus probe measurements.
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
Digital recording and numerical reconstruction of holograms
Ulf Schnars,Werner Jüptner +1 more
TL;DR: The principles and major applications of digital recording and numerical reconstruction of holograms (digital holography) are described, which are applied to measure shape and surface deformation of opaque bodies and refractive index fields within transparent media.
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Simultaneous amplitude-contrast and quantitative phase-contrast microscopy by numerical reconstruction of Fresnel off-axis holograms
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