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Optical frequency comb based parallel fm lidar

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Wavelength modulation spectroscopy: combined frequency and intensity laser modulation

Luc Thévenaz, Philippe Robert

A theoretical model of wavelength modulation spectroscopy that uses a laser diode on a Lorentzian absorption line is presented. This theory describes the general case of a current-modulated semiconductor laser for which a combined intensity and frequency m ...

Optical Society of America2003

An optical modulator

Luc Thévenaz

An optical modulator is arranged to compensate for the thermo-optical modulating effects induced by charge-injection based phase modulators. It comprises first modulator means (3), that receive optical radiation (11, 21), direct it along an optical path, a ...

World Intellectual Property Organization2003

Mesure de traces de gaz à l'aide de lasers à semi-conducteur

Infrared spectroscopy using semiconductor lasers is a promising technique for trace gas detection. It allows a continuous and real time monitoring of several species, with a high sensitivity and a good selectivity. Among all the possible methods two are pa ...

EPFL2002

Cross-correlated chemical shift modulation: A signature of slow internal motions in proteins

Geoffrey Bodenhausen

A novel NMR expt. allows one to characterize slow motion in macromols. The method exploits the fact that motions, such as rotation about dihedral angles, induce correlated fluctuations of the isotropic chem. shifts of the nuclei in the vicinity. The relaxa ...

2001

Trace gas measurement using IR laser diodes

Luc Thévenaz, Philippe Robert

The properties of semiconductor laser diodes for trace gas measurements are reviewed. First, the modulation characteristics of these lasers are discussed. Then, two sensitive spectroscopic methods using a frequency-modulated near-IR laser are presented and ...

2000

Learning navigational maps through potentiation and modulation of hippocampal place cells

Wulfram Gerstner

We analyze a model of navigational map formation based on correlation-based, temporally asymmetric potentiation and depression of synapses between hippocampal place cells. We show that synaptic modification during random exploration of an environment shift ...

1997

Divergent double chirp pulses for refocusing quadrupolar interactions

Geoffrey Bodenhausen

To excite and refocus single quantum coherences in a three-level system with a quadrupolar interaction, it is possible to use frequency-modulated pulses with two diverging frequency components that are swept simultaneously through the two single-quantum tr ...

1996

Broadband decoupling in NMR with frequency-modulated 'chirp' pulses

Geoffrey Bodenhausen

In NMR of spins with I = 1/2 in an isotropic phase, it is demonstrated by simulation and expt. that virtually unlimited bandwidths can be decoupled effectively by using chirp pulses with linear frequency modulation for adiabatic inversion combined with pha ...

1995

Ultra-broadband decoupling

Geoffrey Bodenhausen

The so-call CHIRP-95 scheme for broadband decoupling where inversion is achieved adiabatically by a simple chirp pulse with linear frequency modulation, is described. This decoupling scheme is demonstrated exptl., and showed that extremely large bandwidths ...

1995

Formation and spectral characterisation of Bragg gratings in standard single-mode optical fibers

René Salathé, Hans Georg Limberger

Permanent Bragg gratings in monomode optical fibers are obtained by irradiation through an interference pattern of an ultraviolet laser. The main parameters of such gratings, in particular the index modulation amplitude and their length, are precisely dete ...

1993