Concept

Eyepiece

Related publications (40)

Extended focus depth for Fourier domain optical coherence microscopy

Theo Lasser, Rainer Leitgeb, Martin Villiger, Adrian Bachmann, Lukas Steinmann

We report on a new detection scheme for Fourier domain optical coherence microscopy that exhibits high transverse resolution along an axially extended focal range. Nearly constant transverse resolution of ∼1.5 μm along a focal range of 200 μm is experiment ...

2006

Emerging light fields from liquid crystal microlenses

Toralf Scharf

Liquid crystal (LC) microlenses have a variable focal length with a change in applied voltage. These lenses have suitable dimensions and focal length variations for a wide range of applications where the absence of moving parts is favored. In this article ...

2006

Numerical aberrations compensation and polarization imaging in digital holographic microscopy

Tristan Colomb

In this thesis, we describe a method for the numerical reconstruction of the complete wavefront properties from a single digital hologram: the amplitude, the phase and the polarization state. For this purpose, we present the principle of digital holographi ...

EPFL2006

On the chromatic aberration of microlenses

Hans Peter Herzig, Toralf Scharf

The optical properties of plano-convex refractive microlenses with low Fresnel Number (typically FN < 10) are investigated. It turns out that diffraction effects at the lens aperture limit the range of the effective focal length. The upper limit of the foc ...

2006

Birefringence measurement by use of digital holographic microscopy: examples with fiber optics and concrete samples

Christian Depeursinge, Tristan Colomb, Etienne Cuche

In this paper, we present a modified transmission digital holographic microscope that can be used to image the state of polarization. The resulting device, called polarization digital holographic microscope (Pol-DHM), records in off-axis geometry the inter ...

SPIE2005

Dispersion compensation for optical coherence tomography depth-scan signals by a numerical technique

Theo Lasser, Boris Clément Karamata

A new numerical a posteriori dispersion compensation technique for partial coherence interferometry and optical coherence tomography depth-scan signals is presented. This technique is based on numerical correlation of the depth-scan interferometer signal w ...

2002

Numerical dispersion compensation for Partial Coherence Interferometry and Optical Coherence Tomography

Theo Lasser, Boris Clément Karamata

Dispersive samples introduce a wavelength dependent phase distortion to the probe beam. This leads to a noticeable loss of depth resolution in high resolution OCT using broadband light sources. The standard technique to avoid this consequence is to balance ...

2001

Rigorous analysis of focusing grating couplers using a time-domain spectral collocation method

Jan Sickmann Hesthaven

Diffractive optical elements comprising sub-wavelength aperiodic surface reliefs of finite length require the use of rigorous solvers for Maxwell's equations. We present a detailed analysis of Focusing Grating Couplers (FGC's) using a recently introduced 2 ...

SPIE2000

Optical logic gates by nonlinear mixing in BBO

Demetri Psaltis

An experimental demonstration of a set of optical logic gates (OR, XOR, AND) is shown using non-linear mixing in a BBO crystal. Pulses generated by a femtosecond Ti:Sapphire laser at 800 nm (140 fs duration, 2nJ/pulse) are split in 4 beams evenly separated ...

Spie-Int Soc Optical Engineering, Po Box 10, Bellingham, Wa 98227-0010 Usa1999

Eye-guided laser surgery

Klaus Benedikt Schönenberger

The application of lasers in microsurgery and in particular in neurosurgery offers many advantages such as, e.g., hemostasis, no-touch (i.e. aseptic) procedures, and pinpoint accuracy. However, these advantages can often not be fully exploited since adequa ...

EPFL1996

Graph Chatbot

Chat with Graph Search

Ask any question about EPFL courses, lectures, exercises, research, news, etc. or try the example questions below.

DISCLAIMER: The Graph Chatbot is not programmed to provide explicit or categorical answers to your questions. Rather, it transforms your questions into API requests that are distributed across the various IT services officially administered by EPFL. Its purpose is solely to collect and recommend relevant references to content that you can explore to help you answer your questions.