Concept

Miroir en bronze

Publications associées (41)

First mirror tests for ITER: influence of material choice on the deposition/ erosion mechanisms affecting optical reflectivity

Almost all optical diagnostics systems on ITER will be based on in-vessel metallic first mirrors. The possible deterioration of their surface reflectivity as a result of erosion by charge-exchange neutrals and re-deposition of material eroded from the plas ...

2006

Multiple scattering in optical coherence tomography. I. Investigation and modeling

Theo Lasser, Boris Clément Karamata, Marcel Leutenegger, Stéphane Bourquin, Markus Laubscher

We present a new model of optical coherence tomography (OCT) taking into account multiple scattering. A theoretical analysis and experimental investigation reveals that in OCT, despite multiple scattering, the field backscattered from the sample is general ...

2005

High speed full range complex spectral domain optical coherence tomography

Rainer Leitgeb

We present a high speed full range spectral domain optical coherence tomography system. By inserting a phase modulator into the reference arm and recording of every other spectrum with a 90° phase shift (introduced by the phase modulator) we are able to di ...

2005

Phase shifted microcavities

Ross Stanley

An optically-active multi-layer dielectric structure comprises an optically active zone between two mirrors forming a Fabry-Perot microcavity. The optically active zone comprises an optically active material of wavelength lambda centred in a layer of high ...

2004

Resonator stability subject to dynamic random-tilt aberration

Theo Lasser, Max-Olivier Hongler

We derive the behavior of the average exit time (i.e., the number of reflections before escape) of a ray path traveling between two perfect mirrors subject to dynamic random-tilt aberrations. Our calculation is performed in the paraxial approximation. When ...

2003

Applications of the cavity ring-down technique to a large-area rf-plasma reactor

Christoph Hollenstein, Alan Howling, Daniele Romanini

The cavity ring-down technique is applied to an industrial-scale radio-frequency (rf) plasma reactor for the measurement of the density and spatial profile of negative ions in pure oxygen and hydrogen rf plasmas, and for the detection of nanometric particl ...

1999

Directional effects in photonic bandgap cavities

Romuald Houdré, Ursula Oesterle, Henri Benisty

We present here measurements on hexagonal cavities that have areas between 2.0 and 8.6 mu m/sup 2/. The 2D triangular lattice PBG mirrors are etched into a GaAs/AlGaAs waveguide heterostructure with 3 layers of InAs quantum dots at the centre of a 240 nm t ...

1999

Local ideal magnetohydrodynamic stability of a quasihelically symmetric stellarator

Wilfred Anthony Cooper

The ideal magnetohydrodynamic stability with respect to localized ballooning modes and the Mercier criterion of a quasihelically symmetric stellarator configuration is investigated. Configurations with an enhanced magnetic mirror and a deeper magnetic well ...

1996

Measurements of loss and mirror reflectivity in semiconductor optical waveguides: A European interlaboratory comparison experiment

Luc Thévenaz, Wilfried Noell

The results of round-robin measurements of waveguide loss and integrated mirror reflectivity in several European laboratories in the frame of the COST 240 project are presented. The Fabry-Perot cavity contrast method was used on semiconductor optical waveg ...

Natl Inst of Standards & Technology1994

Method for measuring the chromatic dispersion of an optical fibre and apparatus for implementing such method

Luc Thévenaz

The apparatus according to the invention comprises a coupler (30) intended to couple between each other two monomode fibres presenting four branches (31, 32, 33, 34). The branch (31) is connected to a branch (36). The branch (33) is the reference fibre and ...

World Intellectual Property Organization1988

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