Abstract: A device to control the aiming and focusing of laser systems on a target comprises at least one reflecting false target (21) positioned and oriented substantially identically to the target (3), a lens (12) for the focusing of the beam on this false target, a separator device (11), a wavefront analyzer (35), a mirror (33) and a semi-reflective plate (32), the beam (1) getting focused, at the end of the system, on the false target (21) after getting reflected on the separator device (11). A part (31) of the beam with the same wavelength as that of the part reflected by the separator device (11) goes through this device and the semi-reflective plate (32) to get directed towards the wavefront analyzer (35). The beam reflected by the false target (21) goes through the separator grating (11) to get reflected on the mirror (33) and the semi-reflective plate (32) to get directed towards the wavefront analyzer (35).

Abstract: A device for the alignment of a laser beam amplification system comprises at least measuring means and alignment templates positioned instead of filtering hole plates of the amplification system, the alignment templates having holes whose centers have substantially the same spatial positions as the centers of the filtering holes, certain template holes being provided with reference sights offset in an angular way with respect to one another, the tips of these sights being pointed towards the center of the holes, the measuring means defining, by sighting at the end of the amplification system, the divergences between the focusing points of the beam in the holes, merged at a single point, and the tips of the sights, their angular positions enabling them to be assigned to their respective holes, the positions of elements of the amplification system being then controlled as a function of the measurements of divergences.

Abstract: This optical device has, in the rear of the projectile, a retro-reflector fitted out with a polarizer and, at the projectile firing station, a light source whose beam illuminates the rear of the projectile, and a light flux analyzer deducing the roll angle of the projectile from the direction of polarization of the light flux reflected by this projectile, wherein the polarizer is a polarizer with refraction index discontinuity positioned on the rear of the projectile, before the retro-reflector, with an angle of inclination between the direction normal to its plane of index variation and the longitudinal axis of the projectile chosen to be greater than the Brewster angle, and wherein the light source is offset laterally with respect to firing axis of the projectile, these two measurements giving rise to a modulation of intensity of the reflected light beam as a function of the roll angle plus or minus 2.pi.

Abstract: This optical device comprises, at the rear of the projectile (3), a catadioptric system (15) equipped with a polariser (16) and, at the firing station of the projectile (3), a light source (5) whose beam illuminates the rear of the projectile (3) and a light-flux analyzer (6) calculating from the polarization direction of the light flux reflected by the projectile (3) the roll angle of the latter. It is noteworthy in that it comprises, in order to remove the ambiguity of .pi. from the measurement of the roll angle, a reflector dihedron (20) which is positioned along the side of the projectile and which reflects the light beam from the source (5) back to the light-flux analyzer (6) once per turn of the roll of the projectile (3) when the light source (5) is not blocked from it by the body of the projectile (3).

Abstract: The invention relates to a solid laser with an emission wavelength lying between 0.5 and 0.65 .mu.m. A chromium-doped Mg.sub.2 SiO.sub.4 (forsterite) laser rod is pumped by a laser diode emitting between 0.75 and 0.8 .mu.m, this laser diode having an active layer which is Ga.sub.1-x Al.sub.x As based, with x lying between 0.1 and 0.18. The laser device finds particular application in the isotopic separation of uranium.

Abstract: Disclosed is a laser pulse generator in which a single pulse is generated from a train of pulses. The amplitude of this single pulse is the addition of the amplitudes of the pulses of the train of pulses. This addition is done in a non-linear crystal inserted in an optical loop. The train of pulses takes the place of a pump wave applied to the non-linear crystal and the signal circulating in the optical loop takes the place of a signal wave. This signal wave therefore benefits from a transfer of energy coming from the pump wave because of the interaction in the non-linear crystal.

Abstract: A laser device for guiding a missile to a target such as an enemy tank, includes a laser transmitter (1) which transmits radiation (2) which is received by a modulator (30) capable of delivering two distinct pulsed beams (51, 52) in response thereto. The first beam (51) is directed to a missile (7) to measure the angle and the distance of the missile and to convey piloting instructions thereto by modulation of said pulses, and the second beam (52) is directed towards a target (55) by a reflector (54) mounted on an aiming sight (22) in order to measure the distance to the target. The device further includes a computer (28) for determining the trajectory to be followed by the missile towards the target on the basis of the distances to the missile and to the target and on the basis of the angle between said distances.