Abstract: The field of the invention is that of solid-state laser gyros. One of the major problems inherent in this technology is that the optical cavity of this type of laser gyro is by nature highly unstable. To reduce this instability, controlled optical are introduced into the cavity that depend on the direction of propagation by using acoustooptic devices. Several devices are described, employing different configurations of acoustooptic devices. These devices apply in particular to laser gyros having monolithic cavities, and in particular to neodymium-doped YAG laser gyros.

Abstract: The field of the invention is that of solid-state laser gyros. One of the major problems inherent in this technology is that the optical cavity of this type of laser gyro is by nature highly unstable. To reduce this instability, the invention proposes to introduce, into the cavity, controlled optical losses that depend on the direction of propagation by using acoustooptic devices. Several devices are described, employing different configurations of acoustooptic devices. These devices apply in particular to laser gyros having monolithic cavities, and in particular to neodymium-doped YAG laser gyros.

Abstract: A longitudinally pumped laser including one or more active lasing media arranged in an optical laser cavity and at least one pumping device emitting at least one pumping beam toward the at least one active lasing medium. The pumped beam or beams is coupled with the active medium. At least one of the active lasing media includes one or more non-homogeneously doped zones, and the dimension of the doped zones and/or the distribution of the dopants is chosen on the basis of the desired transverse mode of the laser cavity. Such a laser can be used as an amplifier.

Abstract: Longitudinally pumped laser comprising one or more active lasing media arranged in an optical cavity and at least one pumping means (4) emitting at least one pumping beam toward the active lasing medium or media (3), means (5) for the coupling of the pumped beam or beams with the active medium, characterized in that at least one of the active lasing media comprises one or more non-homogeneously doped zones (8) and in that the dimension of said doped zones (8) and/or the distribution of the dopants is chosen on the basis of the desired transverse mode of the laser cavity.

Abstract: The interferometer of the invention, of the type with an optical fibre in ring form, with a measuring head (16) connected to a distant processing center (18) by cables, has an optoelectronic detector (17) removed to the center and connected to the measuring head by a multimode optical fibre (19).

Abstract: A method and corresponding device, are provided for detecting the propagation time variations in the ring of an interferometer and includes phase modulation of the contrarotating waves travelling through the ring by means of assymetric square waves at a period twice the initial propagation time, which create level zero phase shift stretches in the modulation of the difference between the two waves emerging from the ring. These level stretches result in pulses in the detected output signal whose width is variable with the propagation time. The invention applies particularly to the control of the wave length of the source of the interferometer, particularly with respect to temperature variations of the source.