Concept

Frequency mixer

Related publications (102)

Phase sensitive Fourier domain optical coherence tomography

Theo Lasser, Rainer Leitgeb, Adrian Bachmann

Optical Coherence Tomography (OCT) is an imaging technique with high axial resolution in the micro-meter-scale range combined with a high sensitivity allowing for example to probe weakly back-scattering structures beneath the surface of biological tissues ...

2006

Complex unltrahigh resolution Fourier domain optical coherence tomography

Theo Lasser, Rainer Leitgeb, Adrian Bachmann

Fourier domain optical coherence tomography (FDOCT) is a high speed imaging technique with high axial resolution in the micro-meter-scale range combined with a high sensitivity allowing to probe 3D volumes of weakly back- scattering biological tissues in-v ...

SPIE2006

Cascading second-order versus direct third-order nonlinear optical processes in a uniaxial crystal

Sylvie Roke

We present an experimental and theoretical study of sum-frequency generation of two infrared photons and one visible photon in a lithium iodate crystal. The sum-frequency light can be generated directly in a third-order process as well as in two subsequent ...

2004

Asymptotical Analysis of Timing Imperfections in UWB Receivers

Pierre-André Farine, Cyril Botteron, John Farserotu

Abstract—In this paper, a model is proposed to analyze the influence of timing imperfections on ultra-wide bandwidth (UWB) time-hopping spread-spectrum (TH-SS) signaling schemes, where N pulses are coherently added to increase the received signal-tonoise r ...

2004

High-power long-pulse second harmonic generation and optical damage with free-running Nd : YAG laser

René Salathé, Thomas Sidler, Sébastian Favre

Frequency doubling with a free-running long-pulse Nd:YAG laser and LBO or KTP nonlinear crystals yields conversion efficiency of up to 17.5% and 162 W peak power in the second harmonic. This efficiency is obtained for a TEM00 beam with rectangular temporal ...

2003

Method and device for measuring the optical properties of transparent and/or diffusive objects

René Salathé

The inventive method for measuring the optical properties of transparent and/or diffusive objects (18), especially their reflection profile, uses two coupled interferometers. Said coupled interferometers are operated with two beams of different coherence l ...

2002

An Analysis of Flicker Noise Rejection in Low-Power and Low-Voltage CMOS Mixers

Christian Enz

The sensitivity of RF CMOS receivers using a direct conversion or a low-IF architecture is strongly affected by flicker noise. This paper gives theoretical guidelines to predict the flicker noise in Gilbert-cell mixers. The conversion gain, the equivalent ...

2001

Génération de deuxième et troisième harmonique avec un laser Nd:YAG en régime pulsé libre

Sébastian Favre

Industrial laser precision machining is predominately based on pulsed Nd:YAG lasers operated at a wavelength of 1.06 µm in a free running pulse regime. The objective of this thesis work has been to investigate second and third harmonic generation for such ...

EPFL2001

Static micromixers based on large-scale industrial mixer geometry

Philippe Renaud, Arnaud Bertsch

Mixing liquids at the micro-scale is difficult because the low Reynolds numbers in microchannels and in microreactors prohibit the use of conventional mixing techniques based on mechanical actuators and induce turbulence. Static mixers can be used to solve ...

2001

Spectral processing of point-sampled geometry

Mark Pauly

We present a new framework for processing point-sampled objects using spectral methods. By establishing a concept of local frequencies on geometry, we introduce a versatile spectral representation that provides a rich repository of signal processing algori ...

2001

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