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Theoretical Investigation of Iterative Phase Retrieval Algorithm for Quasi-Optical Millimeter-Wave RF Beams

Publications associées (42)

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Demonstration of Electron-Bernstein-Wave Heating in a Tokamak via O-X-B Double-Mode Conversion

Laurie Porte, Antoine Pochelon, Yann Camenen, Loïc Curchod

The first demonstration of electron-Bernstein-wave heating by double-mode conversion from the O to the X mode in an overdense H-mode tokamak plasma has been achieved in the Tokamak a` Configuration Variable device. This technique overcomes the upper densit ...

American Physical Society2007

The plenacoustic function and its applications

Thibaut Ajdler

This thesis is a study of the spatial evolution of the sound field. We first present an analysis of the sound field along different geometries. In the case of the sound field studied along a line in a room, we describe a two-dimensional function characteri ...

EPFL2006

Fast focus field calculations

Theo Lasser, Marcel Leutenegger, Rainer Leitgeb, Ramachandra Rao

We present a fast calculation of the electromagnetic field near the focus of an objective with a high numerical aperture (NA). Instead of direct integration, the vectorial Debye diffraction integral is evaluated with the fast Fourier transform for calculat ...

2006

Soft and central mode behaviour in PbMg1/3Nb2/3O3 relaxor ferroelectric

Nava Setter, Kyle Brinkman

The relaxor ferroelectric PbMg1/3Nb2/3O3 (PMN) is investigated by means of dielectric and Fourier transform far infrared transmission spectroscopy in ,the frequency range from 10 kHz to 15 THz at temperatures between 20 and 900 K using mostly thin films on ...

2005

2-laser injection-locking configuration for Brillouin fibre sensors

Luc Thévenaz, Philippe Robert

We propose in this paper a novel method for generating the pump and probe signals for a Brillouin fibre sensor. It is based on the injection locking of two distinct semiconductor lasers, that makes possible the generation of high purity beat signals in the ...

IEEE2002

Spatial filtering for zero-order and twin-image elimination in digital off-axis holography

Christian Depeursinge, Etienne Cuche, Pierre Marquet

Off-axis holograms recorded with a CCD camera are numerically reconstructed with a calculation of scalar diffraction in the Fresnel approximation. We show that the zero order of diffraction and the twin image can be digitally eliminated by means of filteri ...

2000

Transform domain allocation scheme for multimedia watermarking

NOVELTY - The watermark is made imperceptible, e.g. invisible or inaudible, by inserting it into selected parts of the data that are neither significant nor insignificant perceptually. Examples for the domain of embedding are complex Fourier coefficients a ...

2000

Demonstration of microwave generation by a ferroelectric-cathode tube

Catherine Pralong

A ferroelectric cathode is employed in a cyclotron-resonance maser (CRM). The CRM oscillator device operates at similar to 7 GHz, near the cutoff frequency of a hollow cylindrical cavity. The cathode is made of a PLZT 12/65/35 ceramic with high-dielectric ...

1999

Fourier spectrum of curvilinear gratings of the second order

Isaac Amidror

The class of second-order curvilinear gratings consists of all the curvilinear gratings that are obtained by second-order spatial transformations of periodic gratings. It includes, for example, circular, elliptic, and hyperbolic gratings as well as circula ...

Opt. Soc. America1998

Fourier spectrum of radially periodic images

Isaac Amidror

Although the spectrum of radially periodic images is often expressed in terms of finite or infinite series of Bessel functions, such expressions do not clearly reveal the exact impulsive structure of the spectrum. An alternative Fourier decomposition of ra ...

Opt. Soc. America1997