Publications de Frédéric Montfort

Towards an incoherent off-axis digital holographic microscope

Frédéric Montfort, Christian Depeursinge

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

Off-axis digital holographic camera for quantitative phase microscopy

Frédéric Montfort, Christian Depeursinge, Christophe Moser, Zahra Monemhaghdoust

We propose and experimentally demonstrate a digital holographic camera which can be attached to the camera port of a conventional microscope for obtaining digital holograms in a self-reference configuration, under short coherence illumination and in a sing ...

Optical Soc Amer2014

Full field vertical scanning in short coherence digital holographic microscope

Frédéric Montfort, Etienne Cuche, Christian Depeursinge, Christophe Moser

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

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

Frédéric Montfort, Christian Depeursinge, Christophe Moser, 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

Dual wavelength full field imaging in low coherence digital holographic microscopy

Frédéric Montfort, Christian Depeursinge, Christophe Moser, Zahra Monemhaghdoust

A diffractive optical element (DOE) is presented to simultaneously manipulate the coherence plane tilt of a beam containing a plurality of discrete wavelengths. The DOE is inserted into the reference arm of an off-axis dual wavelength low coherence digital ...

Optical Society of America2011

Submicrometer tomography of cells by multiple-wavelength digital holographic microscopy in reflection

Tristan Colomb, Frédéric Montfort, Christian Depeursinge, Pierre Marquet, Jonas Kühn, Nicolas Pavillon, Benjamin Rappaz, Corinne Moratal

We present first results on a method enabling mechanical scanning-free tomography with submicrometer axial resolution by multiple-wavelength digital holographic microscopy. By sequentially acquiring reflection holograms and summing 20 wavefronts equally sp ...

2009

Axial sub-nanometer accuracy in digital holographic microscopy

Tristan Colomb, Frédéric Montfort, Etienne Cuche, Christian Depeursinge, Pierre Marquet, Jonas Kühn, Florian Charrière

2008

On the complex three-dimensional amplitude point spread function of lenses and microscope objectives: theoretical aspects, simulations and measurements by digital holography

Tristan Colomb, Frédéric Montfort, Christian Depeursinge, Pierre Marquet, Jonas Kühn, Florian Charrière, Mihaela Marian

The point spread function is widely used to characterize the three-dimensional imaging capabilities of an optical system. Usually, attention is paid only to the intensity point spread function, whereas the phase point spread function is most often neglecte ...

2007

Real-time dual-wavelength digital holographic microscopy with a single hologram acquisition

Tristan Colomb, Frédéric Montfort, Etienne Cuche, Christian Depeursinge, Pierre Marquet, Jonas Kühn, Florian Charrière

A technique to perform two-wavelengths digital holographic microscopy (DHM) measurements with a single hologram acquisition is presented. The vertical measurement range without phase ambiguity is extended to the micron-range, thanks to the resulting synthe ...

2007

WAVE FRONT SENSING METHOD AND APPARATUS

Tristan Colomb, Frédéric Montfort, Stéphane Bourquin, Etienne Cuche, Christian Depeursinge, Pierre Marquet, Nicolas Aspert, Florian Charrière, Mihaela Marian

A new way of mixing instrumental and digital means is described for the general field of wave front sensing. The present invention describes the use, the definition and the utility of digital operators, called digital wave front operators (DWFO) or ... A n ...

2006

Cell refractive index tomography by digital holographic microscopy

Tristan Colomb, Frédéric Montfort, Etienne Cuche, Christian Depeursinge, Pierre Marquet, Jonas Kühn, Florian Charrière, Mihaela Marian

For what we believe to be the first time, digital holographic microscopy is applied to perform optical diffraction tomography of a pollen grain. Transmission phase images with nanometric axial accuracy are numerically reconstructed from holograms acquired ...

2006

Automatic procedure for aberration compensation in digital holographic microscopy and applications to specimen shape compensation

Tristan Colomb, Frédéric Montfort, Etienne Cuche, Christian Depeursinge, Pierre Marquet, Nicolas Aspert, Jonas Kühn, Florian Charrière

We present a procedure that compensates for phase aberrations in digital holographic microscopy by computing a polynomial phase mask directly from the hologram. The phase-mask parameters are computed automatically without knowledge of physical values such ...

2006

Numerical parametric lens for shifting, magnification and complete aberration compensation in digital holographic microscopy

Tristan Colomb, Frédéric Montfort, Stéphane Bourquin, Etienne Cuche, Christian Depeursinge, Pierre Marquet, Nicolas Aspert, Jonas Kühn, Florian Charrière, Mihaela Marian

The concept of numerical parametric lenses (NPL) is introduced to achieve wavefront reconstruction in digital holography. It is shown that operations usually performed by optical components and described in ray geometrical optics, such as image shifting, m ...

2006

Tomography using multiple wavelengths in digital holographic microscopy

Frédéric Montfort

This thesis presents a new tomographic imaging method using multiple wavelengths in digital holographic microscopy. It is based on the addition of several reconstructed wavefronts measured at different wavelengths. The resulting diffraction tomographic vis ...

EPFL2006

Characterization of microlenses by digital holographic microscopy

Tristan Colomb, Frédéric Montfort, Etienne Cuche, Christian Depeursinge, Pierre Marquet, Jonas Kühn, Florian Charrière

We demonstrate the use of digital holographic microscopy (DHM) as a metrological tool in micro-optics testing. Measurement principles are compared with those performed with Twyman-Green, Mach-Zehnder, and white-light interferometers. Measurements performed ...

2006

Shot noise influence in reconstructed phase image SNR in digital holographic microscopy

Tristan Colomb, Frédéric Montfort, Etienne Cuche, Christian Depeursinge, Pierre Marquet, Florian Charrière

In digital holographic microscopy, shot noise is an intrinsic part of the recording process with the digital camera. We present a study based on simulations and real measurements describing the shot-noise influence in the quality of the reconstructed phase ...

2006

Purely numerical compensation for microscope objective phase curvature in digital holographic microscopy: influence of digital phase mask position

Tristan Colomb, Frédéric Montfort, Etienne Cuche, Christian Depeursinge, Pierre Marquet, Florian Charrière

Introducing a microscope objective in an interferometric setup induces a phase curvature on the resulting wavefront. In digital holography, the compensation of this curvature is often done by introducing an identical curvature in the reference arm and the ...

2006

Submicrometer optical tomography by multiple-wavelength digital holographic microscopy

Tristan Colomb, Frédéric Montfort, Etienne Cuche, Christian Depeursinge, Pierre Marquet, Jonas Kühn, Florian Charrière, Sylvain Herminjard

We present a method for submicrometer tomographic imaging using multiple wavelengths in digital holographic microscopy. This method is based on the recording, at different wavelengths equally separated in the k domain, in off- axis geometry, of the interfe ...

2006

Digital Holographic Microscopy, a new imaging technology applied to nanotechnology and life

Tristan Colomb, Frédéric Montfort, Stéphane Bourquin, Etienne Cuche, Christian Depeursinge, Pierre Marquet, Nicolas Aspert, Jonas Kühn, Florian Charrière, Mihaela Marian, Pierre Magistretti

2005