Centre National De La Recherche Scientifique

France Telecom

Ecole Normale Superieure De Cachan

Xerox Corporation

France Telecom Etablissement Autonome De Droit Public (centre National

Centre National De La Recherche Scientifique-cnrs

Joseph Zyss

Jean-Pierre Levy

Rene Masse

Rolland Hierle

Jacques Pecaut

David Kalman Biegelsen

Noble Marshall Johnson

Michael A Kneissl

Clement Sanchez

Alain Carenco

Richard Kounai Chang

Eric Toussaere

A Douglas Stone

Timothée Pol Jean Toury

Julienne Liang

Isabelle Ledoux

Hakan E Tureci

Grace D Chern

Roland Hierle

Regine Levenson

Jacques Livage

Pascal Griesmar

Germain Pucetti

Rene Masses

The invention relates to a device useful for non-invasive detection of the properties of a medium by means of interferometry. The device comprises an optical source which is used for illuminating a zone of the medium that is to be probed with a light beam, and an interferometer for splitting the light beam into a reference beam and a probe beam. The interferometer has a cutoff frequency for the automatic control of respective path lengths of the reference beam and of the probe beam. The device also comprises scanning means which, together with the probe beam, are used to scan the zone to be probed at an image acquisition frequency greater than the cutoff frequency.

Device and method for the non-invasive detection and measurement of the properties of a medium

The invention relates to a device which is used for the non-invasive detection of an electric potential or field, of the spatial and/or the temporal derivatives thereof, in a medium with a linear or quadratic electrooptical effect. The inventive device comprises: an optical source which is used to illuminate at least one zone of the medium that is to be probed with a light beam, the path of which defines an optical axis; and means for mapping the phase shift of the beam in the zone to be probed. Measuring means which are used to map the light beam phase shift comprise a confocal microscope in which the zone to be probed is placed in order to form an image of a plane of said zone.

Non-invasive electric-filed-detection device and method

A locally-outcoupled optical resonator has whispering gallery modes existing in a nearly circular resonator. Light is outcoupled by providing a local perturbing feature on the perimeter of the locally-outcoupled cavity resonator. The perturbing feature provides an outcoupling or loss mechanism that asymmetrically interacts with circulating whispering gallery modes, thereby making the resonator capable of uni-directional output.

Locally-outcoupled cavity resonator having unidirectional emission

The invention concerns a method for optical recording of data on a photosensitive storage medium, characterized in that the data are encoded according to different possible states for the various components of a non-linear susceptibility tensor of the photosensitive medium and it consists in irradiating simultaneously at least a point of said support with write beams whereof the polarization is controlled for optical recording of a given non-linear susceptibility tensor on the photosensitive medium.

Method for optical data recording and reproducing

The present invention relates to new noncentrosymmetric crystal structures consisting of an optionally substituted 2-amino-5-nitropyridinium halide. It also relates to a process for the preparation of these crystal structures. Finally, it relates to a device with an electro-optical effect comprising said crystal structure.

2-amino-5-nitropyridinium halide crystal structure and process for the

5-amino-5-nitropyridinium halide crystal structure

The invention relates to a transparent sol-gel material which has a susceptibility of the second order X.sub.2, consisting of an inorganic matrix containing organic molecules which have nonlinear optical properties (ONLAOM) oriented in a preferential direction. The materials according to the invention lend themselves to the production of components making use of their linear and nonlinear optical properties (optical telecommunications, processing of the optical signal in analog or digital form, and the like).

Inorganic sol-gel material which has a susceptibility of the second order

2-amino-5-nitropyridinium salts are provided which are usable in non-linear and electrooptics.

2-amino-5-nitropyridinium salts usable in non-linear optics and in

The present invention relates to new left-handed or right-handed monohydrogentartrate crystalline structures having nonlinear quadratic effects and a wide transparency range extending from the visible to the near infrared, consisting of optionally substituted 2-amino-5-nitropyridinium cations in combination with a polyanionic organic matrix formed of left-handed or right-handed monohydrogentartrate anions. It also relates to a process for the preparation of these crystalline structures consisting in mixing one mole of cation base with at least two moles of left-handed and/or right-handed tartaric acid. It finally relates to a device having an electrooptical effect containing said crystalline structure.

Monohydrogentartrate crystalline structure having nonlinear quadratic

In a method of manufacturing a planar optical waveguide based entirely on polymer materials an active polymer is deposited onto a semiconductor substrate between two layers of buffer polymers chosen so that the difference in refractive index on each side of the active polymer is between 0.005 and 0.5 and preferably between 0.01 and 0.4.

Method for manufacturing strip optical waveguides

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Sceaux, France

Joseph Zyss