Thomson-csf

Jean-Yves Duboz

Philippe Bois

Emmanuel Rosencher

Francedillaois Luc

An optoelectronic quantum well device comprises a stack of layers that have different gap widths and constitute quantum wells possessing, in the conduction band, at least two permitted energy levels, this stack of layers being included between two reflection means. The device also comprises a diffraction grating between one of the mirrors and the stack of layers.

Optoelectronic quantum well device having an optical resonant cavity and

Semiconductor hybrid component

Disclosed is an integrated direction finder that can be used to determine the direction of a light beam and, in particular, a laser beam. This direction finder has a substrate transparent to the light beam and means on the rear face to channel a part of the light flux received on this face to the front face which has several photodetector elements. Application to optical measurements.

Integrated direction finder

A photodetector arrangement capable of detecting high-power-light flux and including a set of elementary photodetectors each one of which is individually tested to determine that it has no defects. Each of the photodetectors which is found to be free of objectionable defects is connected in parallel to a common conducting line to thus produce a combined output when radiation impinges on the detector surface. The connection can be hard wired or provided through a set of transistors acting as connection control intermediaries between the good photodetectors and the common conducting line. The active areas of only good photodetectors are thus combined to form a large photodetector area of any desired shape or size without the usual reliability problems. The selective control of the transistors can further be provided by auxiliary control photodetectors to additionally automatically control the size of the active area in response to the area of light being detected or a control light beam.

Large photodetector array

Quantum well detector, in which the active detection zone (2) occupies only a limited area of the device and in which a diffraction grid (5) having a larger surface area than this zone thereby makes it possible to couple to it a greater light flow than that corresponding to the surface area of this zone. In this way, the sensitivity of the device is increased. Application: Detection of optical radiation.

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Cachan, France

Jean-Yves Duboz