Tristan Colomb

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Publications associées (27)

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

Nanoindentation and birefringence measurements on fused silica specimen exposed to low-energy femtosecond pulses

Tristan Colomb, Christian Depeursinge, Yves Bellouard

Femtosecond laser pulses used in a regime below the ablation threshold have two noticeable effects on Fused Silica (a-SiO2): they locally increase the material refractive index and modify its HF etching selectivity. The nature of the structural changes ind ...

2006

Polarization microscopy by use of digital holography: application to optical- fiber birefringence measurements

Tristan Colomb, Etienne Cuche, Christian Depeursinge, Hans Georg Limberger, René Salathé, Pierre Marquet, Florian Dürr

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 re ...

2005

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

Digital holographic microscopy: a noninvasive contrast imaging technique allowing quantitative visualization of living cells with subwavelength axial accuracy

Tristan Colomb, Etienne Cuche, Christian Depeursinge, Pierre Marquet, Pierre Magistretti, Benjamin Rappaz

We have developed a digital holographic microscope (DHM), in a transmission mode, especially dedicated to the quantitative visualization of phase objects such as living cells. The method is based on an original numerical algorithm presented in detail elsew ...

2005

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