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Off-axis low coherence interferometry contouring

Publications associées (34)

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Force sensitive hook for epiretinal membrane peeling in eye surgery

Charles Baur, Sebastian Krzysztof Fifanski, José Luis Rivera Gutiérrez

This project addresses the design, construction and evaluation of a peeling hook with force measurement capability for in-vivo intra-ocular vitreoretinal surgery. The force sensor consists of a miniature multi-degree-offreedom flexure where deformations in ...

2016

Towards an incoherent off-axis digital holographic microscope

Christian Depeursinge, Frédéric Montfort

We propose and experimentally demonstrate a system in which off-axis digital holographic microscopy is realized using a broadband illumination source. Single-shot holographic measurements are enabled, while the coherence noise is removed thanks to the broa ...

Spie-Int Soc Optical Engineering2015

Quantitative phase noise in a two-color low coherence Digital Holographic Microscope

Christian Depeursinge, Christophe Moser, Frédéric Montfort, Zahra Monemhaghdoust

In digital holographic microscopy (DHM), the long coherence length of laser light causes parasitic interferences due to multiple reflections in and by optical components in the optical path of the microscope and thus degrades the image quality. The parasit ...

Spie-Int Soc Optical Engineering2013

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In Digital holography Microscopes (DHM) implemented in the so-called "off axis" configuration, the object and reference wave fronts are not co-planar but form an angle of a few degrees. This results into two main drawbacks. First, the contrast of the inter ...

Optical Soc Amer2013

We report an experimental study of the spontaneous spatial and temporal coherence of polariton condensates generated in the optical parametric oscillator configuration, below and at the parametric threshold, and as a function of condensate area. Above the ...

Optical Soc Amer2013

156 µm 1 watt single frequency semiconductor disk laser

Elyahou Kapon, Alexandru Mereuta, Alexei Sirbu

A single frequency wafer-fused semiconductor disk laser at 1.56 mu m with 1 watt of output power and a coherence length over 5 km in fiber is demonstrated. The result represents the highest output power reported for a narrow-line semiconductor disk laser o ...

Optical Society of America2013

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In off-axis digital holographic microscopy, short coherence length of the source results in an unwanted reduced field of view. A diffractive optical element (DOE) which combines two high efficiency transmission volume phase gratings holographically recorde ...

Spie-Int Soc Optical Engineering, Po Box 10, Bellingham, Wa 98227-0010 Usa2012

Sensitivity of X-ray grating interferometry

Peter Modregger, Simon Rutishauser, Christian David, Marco Stampanoni

It is known that the sensitivity of X-ray phase-contrast grating interferometry with regard to electron density variations present in the sample is related to the minimum detectable refraction angle. In this article a numerical framework is developed that ...

Optical Society of America2011

Unsupervised Extraction of Audio-Visual Objects

Pierre Vandergheynst, Anna Llagostera Casanovas

We propose a novel method to automatically detect and extract the video modality of the sound sources that are present in a scene. For this purpose, we first assess the synchrony between the moving objects captured with a video camera and the sounds record ...

Ieee Service Center, 445 Hoes Lane, Po Box 1331, Piscataway, Nj 08855-1331 Usa2011

Eigenmode analysis of phased-coupled VCSEL arrays using spatial coherence measurements

Elyahou Kapon, Elodie Lamothe, Lars Lundeberg

We apply the modal coherence theory to evaluate the spatial mode structure of a 2 × 2 phase-coupled array of vertical cavity surface emitting lasers (VCSELs). The eigenmode structure is extracted for different pump currents by measuring the degree of spati ...

2011