Abstract: A device for extending the lifetime of a frequency-converting non-linear optical system (19) subjected to the radiation of an intense laser beam includes two plates (2, 3) with flat and parallel surfaces angled on the beam and elements for transverse rotation of the plates (2, 3) suitable for changing the angle of inclination of the first plate in an angular range (i20±?i2) to move the incident beam relative to the optical system (19), while minimizing the amplitude of movement of the output beam (37, 47) on the angular inclination range (i20±?i2) of the first plate. The application of the device in a non-linear optical source including one or more non-linear crystals (1, 16) is also described.

Abstract: A device for extending the lifetime of a frequency-converting non-linear optical system (19) subjected to the radiation of an intense laser beam includes two plates (2, 3) with flat and parallel surfaces angled on the beam and elements for transverse rotation of the plates (2, 3) suitable for changing the angle of inclination of the first plate in an angular range (i20±?i2) to move the incident beam relative to the optical system (19), while minimising the amplitude of movement of the output beam (37, 47) on the angular inclination range (i20±?i2) of the first plate. The application of the device in a non-linear optical source including one or more non-linear crystals (1, 16) is also described.

Abstract: The invention relates to a high-power fiberoptic laser device comprising at least one laser diode (1) capable of transmitting a pump wave, a triggered optical resonator (22) consisting of a first double-sheathed optical fiber (6), an optical amplifier consisting of a second double-sheathed optical fiber (10), first (33) and second (35) optical coupling means capable of coupling said pump wave onto at least one of the two optical fibers (6) and (10). According to the invention, at least one of the two fibers has a configuration according to which the pump wave coupled to this optical fiber (6) or (10) is partially absorbed, generating a residual pump wave which is coupled to the other optical fiber (6) or (10) by second optical coupling means, and said second optical fiber (10) has a length greater than that of the first optical fiber (6).

Abstract: A power fibre laser device includes a power laser diode emitting a pump wave, an optical resonator including fully reflective and partially reflective ends, an amplifying multimode optical fibre, and an optical element coupling the pump wave in the multimode optical fibre. The optical resonator includes at least one submodule consisting of a spatial filtering element and including an optical element having a definite position in the optical submodule so as to enable the optical submodule to reproduce, after a round trip of the laser beam, the amplitude and phase of the fundamental mode of the multimode optical fibre to the input or output face of the multimode optical fibre, whereby minimising losses in the fundamental mode, and enabling the optical submodule to filter the other modes, producing additional losses in the modes in the optical resonator, whereby minimising the number of laser modes that propagate in the optical resonator.

Abstract: A device producing laser pulses of durations smaller than 30 ns, and including along its internal optical axis: a laser resonator of optical length smaller than 2 m including two reflecting ends and incorporating an MPF photonic fiber pumped continuously by at least one pump wave with laser diodes, the laser medium being a medium where the laser wave is guided and has a gain with very weak signal greater than 10 per passage, the resonator also incorporating an optical modulator. The optical modulator may deflect the internal laser axis via an electric control along two stable directions, the first direction corresponding to an axis along which the internal laser beam undergoes sufficient losses to prevent the laser effect, the second direction corresponding to an axis along which the laser beam is reflected towards itself at least partially by an optical return element.

Abstract: The invention relates to a high-power fiberoptic laser device comprising at least one laser diode (1) capable of transmitting a pump wave, a triggered optical resonator (22) consisting of a first double-sheathed optical fiber (6), an optical amplifier consisting of a second double-sheathed optical fiber (10), first (33) and second (35) optical coupling means capable of coupling said pump wave onto at least one of the two optical fibers (6) and (10). According to the invention, at least one of the two fibers has a configuration according to which the pump wave coupled to this optical fiber (6) or (10) is partially absorbed, generating a residual pump wave which is coupled to the other optical fiber (6) or (10) by second optical coupling means, and said second optical fiber (10) has a length greater than that of the first optical fiber (6).

Abstract: A device producing laser pulses of durations smaller than 30 ns, and including along its internal optical axis: a laser resonator of optical length smaller than 2 m including two reflecting ends and incorporating an MPF photonic fibre pumped continuously by at least one pump wave with laser diodes, the laser medium being a medium where the laser wave is guided and has a gain with very weak signal greater than 10 per passage, the resonator also incorporating an optical modulator. The optical modulator may deflect the internal laser axis via an electric control along two stable directions, the first direction corresponding to an axis along which the internal laser beam undergoes sufficient losses to prevent the laser effect, the second direction corresponding to an axis along which the laser beam is reflected towards itself at least partially by an optical return element.

Abstract: A night vision module is adaptable as an input stage on a daylight viewing and aiming device for constituting a system operational during night. It comprises an infra-red imaging unit and a unit for reproducing an image of the field of view of the imaging unit on a screen for display in the input field of the daylight device which has fixed reference marks. The image reproducing unit has a generator for inlaying, in the image of the field, a plurality of marks having a predetermined position with respect to the optical axis of the module, out of the central aiming zone. The inlaid marks are so located as to be centered with respect to the fixed reference marks when the module is harmonized. The module further comprises potentiometers enabling to control the location of the image on the screen and to center the inlaid marks with respect to the reference marks.

Abstract: A polychromatic mutual alignment device is suitable for use in an aiming apparatus having a laser delivering a parallel light beam and a plurality of light receivers to be harmonized with the laser. The device comprises an optical mixer having at least two source-forming holes each receiving light delivered in a respective one of a plurality of spectral ranges for which alignment is to be achieved and a plate which is transparent in a wave length range and reflective in another wave range for combining the two light beams into a common mixer output beam; and a parabolic mirror having an axis and placed so as to receive the output beam at an angle with respect to said the axis, the mixer and the mirror being constructed so that all the source-forming holes are at the focal point of the mirror.