Abstract: A laser system having a cavity formed by at least two sub-cavities and a mechanism for optically pumping a first of the at least two sub-cavities. In the system, the optical pumping mechanism is arranged in such away to not reach a laser emission threshold of the first sub-cavity, the first sub-cavity (2) comprising a device for generating a short pulse, a second sub-cavity (3) comprising an external triggering device. The first and second sub-cavities are coupled such that the triggering of the second sub-cavity has at least two such laser systems, to a light emission system with a wide spectral band, comprising such a laser system and a mechanism for generating non-linear optical effects inserted into the second sub-cavity, and to a light generator with a wide spectral band, comprising such a laser generator having at least one laser system provided with a mechanism for generating non-linear optical effects inserted into the second sub-cavity.

Abstract: A system for emitting a polychromatic light, has a laser cavity device used to optically pump the laser cavity emit radiation according to at least one excitation wavelength and light guiding mechanism arranged in such a way as to supply a polychromatic light to an outlet in the event of excitation by the radiation in a non-linear interaction regime. In the system, the guiding mechanism is arranged inside a cavity formed by at least two sub-cavities, a first sub-cavity forming the laser cavity and a second sub-cavity comprising the guiding mechanism, the first and second sub-cavities being coupled.

Abstract: Method and laser oscillator for the generation of a laser beam—According to the invention with a view to adjusting, inside said laser oscillator (1), the phase of each of the N elementary laser beams (FLE.1, FLE.2, FLE.N) generated on the basis of said laser oscillator (1) in such a way that said elementary laser beams are in phase, the deviation between the phase of an individual elementary laser beam (FLE.1) and the phases of the N?1 other elementary laser beams (FLE.2, FLE.N) is converted into a level of luminous intensity by means of at least one optical filtering element to which at least a part of each elementary laser beam is directed.

Abstract: The invention relates to a laser cavity with central extraction by polarisation for coherent coupling of intense intra-cavity beams. The laser cavity (1) according to the invention comprises an extraction unit (7) with central extraction, which divides the laser cavity (1) longitudinally into two functional portions (P1, P2), namely a first portion (P1) including the active components (3), which amplifies the laser beams (4), and a second portion (P2) which performs coherent coupling of the laser beams (4).

Abstract: A system for emitting a polychromatic light, has a laser cavity device used to optically pump the laser cavity emit radiation according to at least one excitation wavelength and light guiding mechanism arranged in such a way as to supply a polychromatic light to an outlet in the event of excitation by the radiation in a non-linear interaction regime. In the system, the guiding mechanism is arranged inside a cavity formed by at least two sub-cavities, a first sub-cavity forming the laser cavity and a second sub-cavity comprising the guiding mechanism, the first and second sub-cavities being coupled.

Abstract: A laser system having a cavity formed by at least two sub-cavities and a mechanism for optically pumping a first of the at least two sub-cavities. In the system, the optical pumping mechanism is arranged in such away to not reach a laser emission threshold of the first sub-cavity, the first sub-cavity (2) comprising a device for generating a short pulse, a second sub-cavity (3) comprising an external triggering device. The first and second sub-cavities are coupled such that the triggering of the second sub-cavity has at least two such laser systems, to a light emission system with a wide spectral band, comprising such a laser system and a mechanism for generating non-linear optical effects inserted into the second sub-cavity, and to a light generator with a wide spectral band, comprising such a laser generator having at least one laser system provided with a mechanism for generating non-linear optical effects inserted into the second sub-cavity.

Abstract: An active element for a laser source, the active element comprising an elongated bar with a reflective lateral surface, doped to be able to absorb at least a pumping beam being propagated at least approximately longitudinally in the bar in order to amplify at least a laser radiation also being propagated longitudinally; and a jacket in contact with the lateral surface of the bar and presenting a refractive index smaller than that of the bar, in the reflective lateral surface of the bar, there is at least one dull-ground diffusing zone able to interrupt the paths of spurious laser modes being propagated in the bar by total internal reflections on the lateral surface.

Abstract: An adaptive mirror includes a plurality of adjacent combs of piezoelectric material and two electrodes arranged on longitudinal faces opposite a bar are associated with each monolithic bar formed by a tooth of the combs.

Abstract: The invention comprises illuminating a scene where said magnifying optical system (OP) may occur with at least one pulse generated by first laser transmitter (E). The laser transmitter (E) and a first detector of the scene thus illuminated (D1) are adjacent, while a second detector (D2) is remote from said transmitter (E) transversally to the direction (d) of said scene.

Abstract: According to the invention, two simultaneous images with different wavelengths (?1, ?2) are formed in synchronism with each illuminance laser pulse, one of the Images corresponding to the wavelength (?1) of the laser pulses, and the difference between the two images is generated.

Abstract: A pumping system for a laser source includes a pump diode that emits a pump beam having a central wavelength that varies with temperature. A selective mirror having a plurality of spectral reflectivity peaks, corresponding to a plurality of predetermined wavelengths, locks the operation of the pump diode onto one of the predetermined wavelengths in accordance with temperature.

Abstract: According to the invention, the lateral surface (5) of the doped bar (2) comprises at least one dull-ground diffusing zone (19) able to interrupt the paths of the spurious laser modes.

Abstract: The active element (1) comprises an elongate rod (2) that comprises a doped matrix capable of absorbing at least one pump beam (3) in order to amplify at least laser radiation (4) propagating longitudinally, the length and the doping of said elongate rod (2) being such that the proportion of pump energy absorbed by said elongate rod (2) is greater than 90% for the wavelength of an operational spectral range having the lowest absorption coefficient.

Abstract: The pumping system (1) comprises at least one pump diode (12) capable of emitting a pump beam (5), the wavelength of which varies with temperature, at least one collimation means (13), and at least one selective mirror (14) comprising a plurality of spectral reflectivity peaks for locking the operation of the pump diode (12) each time onto at least one of these peaks upon a change in temperature of the pump diode (12) so that the pumping system (1) emits a pump beam (5) whose wavelength varies in steps, corresponding in succession to a plurality of predetermined wavelengths upon the change in temperature.

Abstract: Active element for a laser source and laser source comprising such an active element. According to the invention, the active element for a laser source comprises an elongate rod comprising a doped matrix capable of absorbing a pump beam in order to amplify laser radiation propagating longitudinally, at least one input face for the pump beam, a first reflection face for the pump beam which is inclined with respect to the longitudinal axis of the rod and at least one interacting second reflection face, at least one of the input face and second reflection face being equally inclined.

Abstract: A laser source (1) includes a pumping system (2) and an active element (3) which comprises a doped elongate rod (4) and at least one optical block (5, 6) for guiding the pump rays (F) of at least one pump beam toward the rod (4). The pumping system (2) generates a number of parallel pump rays (F). The entry face (5A, 6A) of the optical block (5, 6) is inclined to the longitudinal axis (X—X) of the rod (4) and is not orthogonal to the pump rays (F) in order to deflect the pump rays (F) by refraction so as to transmit them toward the rod (4), and the inclination of the entry face (5A, 6A) is such that the pump rays (F) reach the bar (4) so as to be distributed over its entire length.

Abstract: According to this method, in order to fabricate active elements which comprise at least one doped part comprising a doping capable of absorbing a pump beam and at least one undoped part, and which have opposed faces of the same geometrical shape, a process of preparing an elongate active rod (5), which has a cross section identical to said geometrical shape, said process comprising at least one step of cutting and one step of joining at least one doped block (6) and at least one undoped block (7, 8), and a process of forming a plurality of active elements from the active rod (5), said formation process comprising at least one step of transverse cutting along the active rod (5) and the step of collectively treating surfaces of the active elements, are carried out in succession.

Abstract: A device for adjusting the lateral position of at least one part of a moving machine for constructing a structure on a terrain includes a measuring device, at least one sensor, a positioning system and a computer adapted to determine theoretical and actual transverse positions of the part of the machine and to command the positioning system in such manner as to render the theoretical and actual transverse positions coincident.

Abstract: The present invention relates to a method and to a device for automatically correcting, in a single application, positioning errors of optical elements of an optical system, with respect to the optical axis of said system. According to the invention, said device (1) has means (A1, A2, Am) for taking measurements representative of image shifts with respect to said optical axis, a calculation unit (UC) for determining on the basis of said measurements, values representative of positioning errors of optical elements, and means (C1, C2, Cn) for automatically modifying the positioning of said optical elements on the basis of these values.

Abstract: Laser device with semiconducting diodes. The invention concerns a device with semiconducting laser diodes comprising individual wafers (8), made of a good heat-conducting material, assembled parallel to one another with semiconducting diode connector bars (9) placed between them as braces, said connector bars only taking up a longitudinal portion of the spaces between the wafers, in which they are located, and the longitudinal portions (17) of said spaces between the wafers, not taken up by said semiconducting connector bars, being used as flow channels for a cooling fluid.