Abstract: The invention relates to optically active coatings for improving the yield of photosolar conversion, consisting of a transparent matrix containing a plurality of optically active constituents absorbing the light energy in a first absorption wavelength lambdaA1 and reemitting the energy in a second wavelength lambdaR1 different from lambdaA1, said optically active constituents being selected such that the reemission wavelength lamdaR1 of at least one type of constituent corresponds to the absorption wavelength lambdaA2 of at least one second type of constituent, characterised in that the C2/C1 ratio of concentration C1 of the optically active constituents of a first type in relation to the concentration C2 of the optically active constituents of said second type is between 0.13 and 0.26; Ci designating the concentration in moles per liter of the constituent i in relation to the doped matrix.

Abstract: The invention relates to method for rendering sustainable the electromagnetic characteristics of optically active composite materials, said method comprising: a first step of preparing doped organic compounds by mixing at least one type of optically active molecules with a protective material in order to prevent the contact thereof with photodegradation-inducing elements and the migration of the optically active molecules; a second step of producing optically active nanoparticles including said doped organic compounds; and a third step of producing optically active composite materials by incorporating the optically active nanoparticles into a polymer matrix.

Abstract: The invention relates to optically active coatings for improving the yield of photosolar conversion, consisting of a transparent matrix containing a plurality of optically active constituents absorbing the light energy in a first absorption wavelength lambdaA1 and reemitting the energy in a second wavelength lambdaR1 different from lambdaA1, said optically active constituents being selected such that the reemission wavelength lamdaR1 of at least one type of constituent corresponds to the absorption wavelength lambdaA2 of at least one second type of constituent, characterised in that the C2/C1 ratio of concentration C1 of the optically active constituents of a first type in relation to the concentration C2 of the optically active constituents of said second type is between 0.13 and 0.26; Ci designating the concentration in moles per litre of the constituent i in relation to the doped matrix.

Abstract: The present disclosure relates to a photovoltaic generator, including at least one block with transparent walls and at least one reflecting wall, as well as photovoltaic cells, wherein the walls opposite the reflecting wall are transparent and include optically active dopants that transform incident solar radiation into radiation, the spectrum of which is shifted towards the range of the photovoltaic cells with the highest sensitivity, and at least one transparent wall is covered with a dichroic filter.

Abstract: The present disclosure relates to a rack with double photovoltaic glazing including a frame with a rabbet, the rabbet containing at least two substantially parallel transparent sheets, i.e. a front sheet intended for receiving sunlight and a rear sheet, wherein the double-glazed rack includes photovoltaic cells located at the back of the rabbet and a coating made of a material forming a cascade of light.

Abstract: A photovoltaic generator including at least one photovoltaic cell, and a transparent matrix placed with at least one optically active material with an absorption wavelength &lgr;a and a reemission wavelength &lgr;r, the optically active material selected such that &lgr;a corresponds to a range of the photovoltaic cell with a lower sensitivity than &lgr;r, the matrix having an input surface and an opposite surface and comprises a reflecting coating an a dichroic filter on the input surface that substantially reflects wavelengths longer than about 950 nm and is substantially transparent for wavelengths less than about 950 nm, and on the opposite surface the matrix has a reflecting coating that reflects wavelengths greater than about 400 nm, and wherein the photovoltaic cell is included in the matrix.

Abstract: A photovoltaic generator including at least one photovoltaic cell, and a transparent matrix placed with at least one optically active material with an absorption wavelength &lgr;a and a reemission wavelength &lgr;r, the optically active material selected such that &lgr;a corresponds to a range of the photovoltaic cell with a lower sensitivity than &lgr;r, the matrix having an input surface and an opposite surface and comprises a reflecting coating an a dichroic filter on the input surface that substantially reflects wavelengths longer than about 950 nm and is substantially transparent for wavelengths less than about 950 nm, and on the opposite surface the matrix has a reflecting coating that reflects wavelengths greater than about 400 nm, and wherein the photovoltaic cell is included in the matrix.

Abstract: This invention relates to a process for setting up several data paths on a single optical transmission fiber, including a modulation step consisting, for each data path, of modulating a light source with a specific wave length by signals corresponding to said data path, a step transmitting the modulated light signals to a mixer and a step of chromatically separating the light signals transmitted by the optical fiber, characterized in that the signals are multiplexed by an integrating sphere coated on the inside with a reflecting surface and including a plane reflector oriented perpendicular to the axis of the transmission optical fiber.

Abstract: The countermeasure process in the field of target evaluation and laser range finding consists in coating at least a portion of a missile with a doped material that absorbs at least a portion of the incident laser beam and reemits a diffuse radiation in a different waveband.The reemission wave length preferably corresponds to an absorption spectrum band of the atmosphere. A portion of the reemitted signal can be used to trigger an alarm.This invention also covers the materials for the implementation of the countermeasure process, they are made of a matrix that is doped with photoluminescent substances. Applications: varnish, paints, canopies, helmet vizors.