Concept

Lyot filter

Publications associées (38)

Jones vector imaging by use of digital holography: Simulation results

Christian Depeursinge, Tristan Colomb, Etienne Cuche

We present a method to image Jones vector by use of digital holography. We show that with unique hologram acquisition, our method permits to image and to calculate Jones vector and therefore polarization parameters. The idea is to use two reference waves p ...

SPIE2003

Tunable optical filter of porous silicon as key component for a MEMS spectrometer

Philippe Renaud, Sandra Schweizer, Gerhard Lammel

We present a microspectrometer based on a tunable interference filter for infrared or visible light that scans the desired part of the spectrum within milliseconds. A single pixel detector measures serially the intensity at selected wavelengths. This conce ...

2002

Photorefractive recording in LiNbO3 : Mn

Demetri Psaltis

The dynamic range, sensitivity, and dark decay of holographic recording of wavelength 458 nm in LiNbO3 crystals doped with 0.2-at. % Mn with different oxidation states have been measured. The measured sensitivity is 0.5 cm/J and is found to be independent ...

2002

Microspectrometer based on a tunable optical filter of porous silicon

Philippe Renaud, Sandra Schweizer, Gerhard Lammel

We present a tunable interference filter for infrared and visible light that scans the desired part of the optical spectrum within milliseconds. A single pixel detector measures serially the intensity at selected wavelengths. This concept avoids expensive ...

2001

MEMS infrared gas spectrometer based on a porous silicon tunable filter

Philippe Renaud, Sandra Schweizer, Gerhard Lammel

We present a MEMS infrared spectrometer for selective and quantitative chemical gas analysis. infrared absorption spectroscopy can distinguish gases easily and also detect nonreactive molecules like CO2, in contrast to e.g. metal oxide gas sensors The foll ...

2001

Low cost microspectrometer

Philippe Renaud, Sandra Schweizer, Gerhard Lammel

2000

Polarization mode dispersion for single-mode fibers with polarization dependent losses

Max-Olivier Hongler, Nicolas Gisin

Birefringent single-mode fibers with random polarization mode coupling and polarization dependent losses are considered. The effect of these losses on polarization mode dispersion (PMD) is computed. The relevant number is found to be the differential loss ...

1993

Birefringence measurements in fibers without polarizer

Luc Thévenaz, Nicolas Gisin

A method for measuring the delay between polarization eigenmodes in either high- or low-birefringence fibers is described. The main advantage of this interferometric method is its ability to perform the measurements without the use of any polarizing device ...

1989

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