Journal ArticleDOI
Polarization microscopy by use of digital holography: application to optical- fiber birefringence measurements
Tristan Colomb,F. Dürr,Etienne Cuche,Pierre Marquet,Hans G. Limberger,Rene-Paul Salathe,Christian Depeursinge +6 more
TLDR
A digital holographic microscope that permits one to image polarization state and the birefringence induced by internal stress in an optical fiber is measured and compared to a standard method, which had been developed to obtain high-resolution bireFringence profiles of optical fibers.Abstract:
We present a digital holographic microscope that permits one to image polarization state. This technique results from the coupling of digital holographic microscopy and polarization digital holography. The interference between two orthogonally polarized reference waves and the wave transmitted by a microscopic sample, magnified by a microscope objective, is recorded on a CCD camera. The off-axis geometry permits one to reconstruct separately from this single hologram two wavefronts that are used to image the object-wave Jones vector. We applied this technique to image the birefringence of a bent fiber. To evaluate the precision of the phase-difference measurement, the birefringence induced by internal stress in an optical fiber is measured and compared to the birefringence profile captured by a standard method, which had been developed to obtain high-resolution birefringence profiles of optical fibers.read more
Citations
More filters
Journal ArticleDOI
Digital holographic microscope for measuring three-dimensional particle distributions and motions
TL;DR: It is demonstrated that digital holographic microscopy can resolve the locations of several thousand particles and can measure their motions and trajectories using cinematographic holography, and a sample trajectory and detailed morphological information of a free-swimming copepod nauplius are presented.
Journal ArticleDOI
Applications of Holography in Fluid Mechanics and Particle Dynamics
Joseph Katz,Jian Sheng +1 more
TL;DR: In this article, a review summarizes recent advances in volumetric particle detection and 3D flow velocimetry involving holography and discusses the debilitating depth-of-focus problem, along with methods that have been implemented to circumvent it.
Journal ArticleDOI
Numerical parametric lens for shifting, magnification, and complete aberration compensation in digital holographic microscopy
Tristan Colomb,Frédéric Montfort,Jonas Kühn,Nicolas Aspert,Etienne Cuche,Anca Marian,Florian Charrière,Sébastien Bourquin,Pierre Marquet,Christian Depeursinge +9 more
TL;DR: It is shown that operations usually performed by optical components and described in ray geometrical optics, such as image shifting, magnification, and especially complete aberration compensation, can be mimicked by numerical computation of a NPL.
Journal ArticleDOI
Morphology and barrier properties of solvent cast composites of thermoplastic biopolymers and purified cellulose fibers
TL;DR: In this article, the morphology, thermal and transport properties of solvent cast biocomposites of poly(lactic acid) (PLA), polyhydroxybutyrate-co-valerate (PHBV) and polycaprolactones (PCL) containing purified alfa micro-cellulose fibers as a function of filler content were discussed.
Journal ArticleDOI
Digital holographic microscopy reveals prey-induced changes in swimming behavior of predatory dinoflagellates.
TL;DR: The present analysis of cinematic digital holographic microscopy data enables simultaneous tracking and characterization of swimming of thousands of cells within dense suspensions, focusing on Karlodinium veneficum and Pfiesteria piscicida and their preys.
References
More filters
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
New polarized light microscope with precision universal compensator
Rudolf Oldenbourg,G. Mei +1 more
TL;DR: A new type of polarized light microscope for fast and orientation‐independent measurement of birefringent fine structure has been developed and incorporates a precision universal compensator made from two liquid crystal variable retarders.
Journal ArticleDOI
Compact complete imaging polarimeter using birefringent wedge prisms.
Kazuhiko Oka,Toshiaki Kaneko +1 more
TL;DR: No mechanical or active elements for analyzing polarization are used, and all the parameters related to the spatially-dependent monochromatic Stokes parameters corresponding to azimuth and ellipticity angles can be determined from a single frame.
Journal ArticleDOI
Digital holographic microscope with automatic focus tracking by detecting sample displacement in real time
TL;DR: A new method for focus tracking during the recording of a sequence of digital holograms while the sample experiences axial displacement is proposed and can be applied as a quasi-real-time procedure.