Thomson-csf

Gerard Doriath

Pierre Hartemann

Manijeh Razeghi

Roger Gaudry

Francois Micheron

Paul-Louis Meunier

Robert Blondeau

Georges Hepner

Martin Defour

Alain Jacobelli

Franck Omnes

Eric Spitz

Joel Martin

Disclosed is an optoelectronic device implanted on a silicon substrate and comprising, in particular, on this substrate, a set of matching layers on which there is made a first confinement layer based on indium phosphide, an active layer based on Ga.sub.x In.sub.1-x As.sub.1-y and a second active layer of indium phosphide.

Group III-V compound based optoelectronic device on silicon substrate

A magnetic field measuring head comprises the following elements integrated into one and the same substrate: a light source, a light guide insensitive to the magnetic field, a layer of magnetic material which, when plunged into a magnetic field to be measured, causes the rotation of the plane of polarization of the light coming from the source, and a device to measure the rotation of the plane of polarization of the light.

Integrated head for the measurement of magnetic fields and method of

A measurement head for a magnetic field gradient vector measuring apparatus, comprising essentially a laser diode emitting two light beams aligned along the same axis. Two magnetic field measuring cells are placed in the paths of these light beams. Each cell comprises a wafer coated with a layer of a magnetic material forming a waveguide. The purpose of each cell is to measure the Faraday effect on the polarization of the magnetic field by using a zero method. A difference circuit then calculates the difference between the commands given to each cell so as to find the value of the magnetic field gradient.

Measurement head for a magnetic field gradient vector measuring

A process and apparatus for measuring a magnetic field based on the Faraday effect rotation of a light beam passing through a ferrimagnetic coating subject to a magnetic field to be measured is shown. The magnetization direction within the ferrimagnetic coating is coherently oriented by applying a high amplitude alternating magnetic field oriented in accordance with the axis of the light beam. This is followed by a progressive reduction of the amplitude of this magnetic field and the magnetic field to be measured is compensated. A system and a measuring cell making it possible to perform said process is also shown.

Measuring system and measuring cell for making magnetic field

A magnetometer measuring head is divided into two separate sub-units, including a first sub-unit including means for transmission and detection of polarized light is coupled via a fibre to a second sub-unit comprising a thin layer of magnetic material within which is guided the light wave transmitted by the fibre. The coupling with the fibre is established via the edge, the opposed end of the layer being provided with a mirror so that the guided wave follows an outgoing and returning path before being retransmitted to the detection means which measure the rotation of the polarization of the light caused by Faraday effect.

Magnetometer probe using a thin-film magnetic material as a

The invention relates to magnetometers making it possible to measure a magnetic field by the Faraday effect in a thin YIG layer which involves taking a YIG layer which is sufficiently thick to permit a multimode transmission of the polarized light beam, as well as the entrance and exit of said beam from the edge of the layer. This device makes it possible to produce a magnetometer head, whose elements are integrated on a substrate and whose volume is approximately 1 cm.sup.3.

Measuring head for magnetometer and magnetometer incorporating such a

The invention relates to electrically controlled switching devices in which a movable member can occupy at least two stable positions. The invention has for its object to provide a switching device in which the movable member is a dielectric body having received a persistent electric charge. This body can occupy stable positions defined on an insulating support by conductive pads. The switching is produced by a potential difference applied between the conductive pads.

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Palaiseau, France

Gerard Doriath