Abstract:
Optical system including an optical projection element, an optical filter configured to filter along a constant filtering direction, a first and a second aperture array comprising a plurality of aperture elements, a location of an aperture element being defined by basis vectors, one basis vector extending in a first direction aligning a plurality of aperture elements and a second basis vector extending in a second direction aligning a plurality of aperture elements. The optical projection element, the filter, the first and second aperture array are arranged along an optical axis to form at least one projection of the optical filter on the first or the second aperture array; or being arranged along an optical axis with the optical filter being placed in front of, behind or on the first aperture array. The constant filtering direction is orientated at an angle relative to the basis vector directions or axes.
Abstract:
A blazed grating, in particular of the microfabricated type, is disclosed as well as mode hop-free tunable lasers in which this grating is employed, and a process for fabricating gratings of this type. The grating lies in a general plane and comprises a plurality of elongate beams carrying mutually parallel respective reflection surfaces spaced apart from one another with a predefined pitch, each of these reflection surfaces having a normal direction inclined at a grating angle α to the normal direction of the general plane. Furthermore, the grating comprises a plurality of resilient suspension arms connected to the beams and intended to be fastened to a grating support. The suspension arms, the beams and their respective reflection surfaces define an assembly formed from a single part. A first pair of comb electrodes is provided for applying a mechanical force to this assembly, these being placed on a first side of the grating, along an axis transverse to the beams, and designed so as to allow the pitch of the grating to be modified in response to the application of the mechanical force. A second pair of electrodes placed on the opposite side from the first allows, in combination with the first pair, application of a displacement of the assembly, possibly without deforming it. It is thus possible to modulate the wavelength and/or the phase of a light beam with a device that is simple and inexpensive to fabricate and has a small footprint.
Abstract:
Optical system including at least one objective lens, an optical filter and an imaging lens or a first aperture array comprising a plurality of aperture elements. The at least one objective lens, the optical filter, and the imaging lens or first aperture array are arranged along an optical axis to form at least one projection of the optical filter on the imaging lens or on the first aperture array. The optical system further includes a filter selection means for selecting filtered electromagnetic radiation to be provided to the imaging lens or the first aperture array.
Abstract:
The present invention relates to an optical system including at least one objective lens (2) for receiving light from an object (1), an array of image forming elements (4) for generating multiple images of the object on an image sensor plane (SP) and a filter (F). The optical system is configured to form a real image of the filter on the array of image forming elements to filter the multiple images of the object, the filter being arranged with respect to the at least one objective lens so that a real image of the filter is formed on the array of image forming elements, and wherein the optical system is configured to be telecentric in the image plane of the filter.
Abstract:
La présente invention se rapporte à un procédé de réalisation d'assemblages supramoléculaires particuliers de colorants, notamment de cyanines, appelés agrégats J. Selon l'invention, le procédé consiste à déposer sur un support une monocouche de dendrimères sur laquelle est ensuite déposée des cyanines en solution qui formeront une monocouche organisée d'agrégats J. Ce procédé peut être utilisé pour réaliser une source de lumière secondaire (28) capable d'injecter de la lumière dans un guide d'onde (24) à partir de l'énergie lumineuse reçue d'une source de lumière primaire (30) émettant à une longueur d'onde différente. La source secondaire formée d'agrégats J incorporant des accepteurs d'énergie peut ainsi être intégrée dans le dispositif optique (23) qui incorpore le guide d'onde.
Abstract:
Optical system including at least one objective lens, an optical filter and an imaging lens or a first aperture array comprising a plurality of aperture elements. The at least one objective lens, the optical filter, and the imaging lens or first aperture array are arranged along an optical axis to form at least one projection of the optical filter on the imaging lens or on the first aperture array. The optical system further includes a filter selection means for selecting filtered electromagnetic radiation to be provided to the imaging lens or the first aperture array.
Abstract:
Position measurement system (1) for determining 2D displacement or position of a mobile element with respect to a reference frame (20), comprising: - a point light source (2) fixed on a reference frame (20); - an optical mask (40), comprising transparent and opaque areas on at least one side of its surfaces, said areas defining a pattern comprising a regular pattern; - an imager (50), fixed to a mobile element, comprising integrated electronic circuits allowing detection, computing and analyzing of a shadow projected by the optical mask (40), and characterized in that the system (1) comprises an optical diffuser plate (30) positioned between said point light source (2) and the optical mask (40) and characterized in that the imager (50), the optical mask (40) and the optical diffuser plate (30) form an assembly (11) so as to produce a light spot (6) created by the scattering of the incident light beam (4) emitted by the point light source (2) on said optical diffuser plate (30), and characterized in that said optical mask (40), positioned in between said optical diffuser plate (30) and said imager (50), produces a shadow on said Imager (50), allowing to compute and provide 2D position of the mobile element relative to the fixed reference frame (20).
Abstract:
An optical device (1) is disclosed comprising an electrically conductive membrane (10) comprising a two dimensional non-periodic array (13) of sub-wavelength through-holes (12). The electrically conductive membrane (10) is arranged to reflect and transmit at least a portion of an incident light beam on the optical device (1) so that little or no loss through diffraction, scattering or the excitation of surface plasmons of the incident and transmitted light beam by the optical filter (1) occurs. A tunable Fabry-Perot filter (50) is also disclosed comprising at least one optical device (1) comprising an electrically conductive membrane (10) comprising a two dimensional non-periodic array of sub-wavelength through-holes. The invention relates also to methods of fabrication of the optical device (1) and the tunable Fabry-Perot filter (50). The invention discloses also a method to tune the tunable Fabry-Perot filter (50) by a postprocessing etching technique.
Abstract:
Position measurement system (1) for determining 2D displacement or position of a mobile element with respect to a reference frame (20), comprising: - a point light source (2) fixed on a reference frame (20); - an optical mask (40), comprising transparent and opaque areas on at least one side of its surfaces, said areas defining a pattern comprising a regular pattern; - an imager (50), fixed to a mobile element, comprising integrated electronic circuits allowing detection, computing and analyzing of a shadow projected by the optical mask (40), and characterized in that the system (1) comprises an optical diffuser plate (30) positioned between said point light source (2) and the optical mask (40) and characterized in that the imager (50), the optical mask (40) and the optical diffuser plate (30) form an assembly (11) so as to produce a light spot (6) created by the scattering of the incident light beam (4) emitted by the point light source (2) on said optical diffuser plate (30), and characterized in that said optical mask (40), positioned in between said optical diffuser plate (30) and said imager (50), produces a shadow on said Imager (50), allowing to compute and provide 2D position of the mobile element relative to the fixed reference frame (20).