Silios Technologies

Other

Ecole Polytechnique

Office National D'etudes Et De Recherches Aerospatiales

Stéphane Tisserand

Laurent Roux

Nicolas Guerineau

Marc Hubert

Vincent Sauget

Fabien Reversat

Aurélien Faiola

Federico Canova

Jean-Paul Chambaret

Frank Torregrossa

François Flory

Ludovic Escoubas

Emmanuel Drouard

A multispectral imager is provided, designed for analyzing a spectral domain of interest, comprising an image sensor formed of an array of macropixels and comprising a first and a second photosensitive pixel respectively dedicated to a first and a second spectral band, and a filtering structure comprising a first and second interference filter which are superimposed respectively on the first and second photosensitive pixel and which are arranged to respectively transmit a first and second electromagnetic radiation belonging respectively to the first and second spectral bands, the multispectral imager in which a wavelength half of that of the second electromagnetic radiation is located in the spectral domain of interest, and a filtering layer is superimposed on the second photosensitive pixel and configured to block the passage of a third electromagnetic radiation of wavelength half that of the second electromagnetic radiation.

Multispectral imager with enlarged spectral domain

A method of limiting cross-talk in an imaging sensor, the sensor being in the form of a matrix of macropixels defining an image, each macropixel being formed by a matrix of individual pixels, each of which is dedicated to a distinct spectral band, all of the individual pixels dedicated to the same spectral band forming a sub-image, the image being topologically subdivided into at least one parcel, and the method including the following steps: measuring the spectral response of each individual pixel &#x3bb;; calculating the mean spectral response of each sub-image in a parcel; targeting to define the ideal response of each sub-image in the parcel; estimating a series of coefficients for minimizing cross-talk in the parcel; and applying the coefficients to the macropixels in order to correct the sub-images in the parcel. The method is remarkable in that the ideal response is a Gaussian function.

Method for limiting crosstalk in an image sensor

A system for homogenizing a laser pulse emitted by a laser source in order to illuminate a target homogeneously, the system having, between the laser source and the target: a phase plate constituted by a plurality of subpupils capable of generating a plurality of delayed laser beams towards the target, the path difference &#x394;d between two adjacent delayed laser beams being greater than or equal to the length of the temporal coherence Tof the laser pulse, and focusing device; wherein the subpupils and the focusing device are adjusted so that the delayed laser beams are superimposed on the target in a homogeneous spot.

Homogenizer including a phase plate

The invention provides a waveguide comprising a channelon an optical substrate, the refractive index of the channel being higher than that of the substrate. The waveguide includes at least one guide layerarranged on the channel, the index of said guide layer being higher than that of the substrate. In addition, the channelis integrated in the substrate. advantageously, the waveguide further includes a covering layerdeposited on the guide layer, the index of said covering layer being lower than that of the guide layer and lower than that of the channel. The invention also provides a method of fabricating the waveguide.

Waveguide comprising a channel on an optical substrate

Growing community of inventors

Marseilles, France

Stéphane Tisserand