Abstract: A device for measuring the concentration of a gas contained in a cavity and for checking the operation of a catalytic element in an exhaust line in an automobile vehicle. A first emitter (E1) composed of an optical pumped micro-cavity and for which the emission spectrum is within the gas absorption band emits a first radiation that passes through the cavity. A second emitter emits a second radiation that passes through the cavity. A receptor measures the optical intensity (I) of the radiation that passed through the cavity.

Abstract: An optical pump device including a pump source optically connected to an optical divider including one input channel and n output channels. The input channel is configured to receive a pump wave derived from the source and the n output channels are configured to output n pump waves, where n is an integer greater than 1. The pump device can be used in an optical amplification device. The device has applications in all domains in which several optical pumps are necessary, and more particularly in the domain of optical telecommunications, and for example for optical amplifiers.

Abstract: An active coupling device enabling a light signal to be coupled to an optical component having a waveguide. The light signal has a first range of wavelengths. The active coupling device is configured to receive the light signal and to emit a light wave in a second range of wavelengths. The optical component comprises at least one input waveguide associated with a third range of wavelengths. The second range of wavelengths lies at least in part in the third range of wavelengths. The Active coupling device can be incorporated in an optical structure and can be useful in the fabrication of a structure including an optical component such as an optical amplifier, spectrum inverter or frequency converter.

Abstract: This invention relates to an optical pump device comprising a pump source optically connected to an optical divider comprising one input channel and n output channels, the input channel being capable of receiving a pump wave S derived from the source and the n output channels being capable of outputting n pump waves S1, . . . Sn, where n is an integer greater than 1. It also relates to the use of the pump device in an optical amplification device. The invention has applications in all domains in which several optical pumps are necessary, and more particularly in the domain of optical telecommunications, and for example for optical amplifiers.

Abstract: A laser source includes a first optical element and a second optical element spaced apart from each other and defining a laser cavity therebetween. The laser cavity with a lasing material therein are capable of emitting an optical beam. The laser source also includes a guided optical element formed on a substrate. The guided optical element includes a mirror which is concave in at least one guide plane of an input guide area of the guided optical element. The mirror forms an extended laser cavity with the laser cavity. The guided optical element also includes a microguide associated with an optical output of the laser source. The microguide defines an output area of the guided optical element. The input guide area is capable of receiving the optical beam emitted by the laser cavity and capable of transmitting the optical beam to an adaptor guide area located between the input guide area and the microguide. The adaptor guide area is capable of guiding the optical beam to the microguide.

Abstract: The invention concerns an ultrahigh frequency emitting device, having: at least a first and a second microlaser (22, 24), emitting at two different frequencies &ohgr;1 and &ohgr;2, means of slaving the first and the second microlaser frequency-wise, an array of N elements (N≧2) (52, 54, 56, 58) placed on the path of the beam of the second laser, each element making it possible to impose a phase delay on the beam which passes through it, N means (26, 28, 30, 32) for mixing the beam emitted by the first laser and each of the N delayed beams, and for producing N signals of frequency &ohgr;1-&ohgr;2, N antenna-forming means (34, 36, 38, 40) for emitting radiation at the frequency &ohgr;1-&ohgr;2.

Abstract: A device for measuring the concentration of a gas contained in a cavity and for checking the operation of a catalytic element in an exhaust line in an automobile vehicle. A first emitter (E1) composed of an optical pumped micro-cavity and for which the emission spectrum is within the gas absorption band emits a first radiation that passes through the cavity. A second emitter emits a second radiation that passes through the cavity. A receptor measures the optical intensity (I) of the radiation that passed through the cavity.

Abstract: The invention relates to a velocity measurement device of the coherent detection type comprising:an active laser medium (10),an input mirror (M.sub.1) and a first output mirror (M.sub.3) defining, with the laser medium, a first resonant cavity of quality factor Q.sub.max making it possible to emit a laser beam (4),a second output mirror (M.sub.2) defining, with the active laser medium (10) and the input mirror (M.sub.1), a second resonant cavity of quality factor Q.sub.min (<Q.sub.max), making it possible to amplify a measuring signal from a target which has intercepted the laser beam (4) emitted with the aid of the first resonant cavity.

Abstract: The invention relates to a microlaser cavity (10) having:a solid active medium (2) emitting at least in a wavelength range between 1.5 and 1.6 .mu.m, anda saturable absorber (4) of formula CaF.sub.2 :Co.sup.2+ or MgF.sub.2 :Co.sup.2+ or SrF.sub.2 :Co.sup.2+ or BaF.sub.2 :Co.sup.2+ or La.sub.0.9 Mg.sub.0.5-x Co.sub.x Al.sub.11.433 O.sub.19 or YAlO.sub.3 :Co.sup.2+ (or YAl.sub.5-2x Co.sub.x Si.sub.x O.sub.3) or Y.sub.3 Al.sub.5-x-y Ga.sub.x Sc.sub.y O.sub.12 :Co.sup.2+ (or .sub.-3 Al.sub.5-x-y2z Ga.sub.x Sc.sub.y Co.sub.z Si.sub.z O.sub.12) or Y.sub.3-x Lu.sub.x Al.sub.5 O.sub.12 Co.sup.2+ (or Y.sub.3-x Lu.sub.x Al.sub.5-2y Co.sub.y Si.sub.y O.sub.3) or Sr.sub.1-x Mg.sub.x La.sub.y Al.sub.12-y O.sub.12 :Co.sup.2+ (or Sr.sub.1-x Mg.sub.x-y Co.sub.y La.sub.z Al.sub.12-z O.sub.12, with o<y<x).

Abstract: The invention relates to an active laser material having a base material doped with active ions, giving said base material laser properties, the ion concentration being equal to or higher than 2%.The invention also relates to a microlaser produced with such a material, as well as a process for producing such a material. The microlaser incorporates an active medium (6) produced by epitaxial growth on a substrate (8), the latter then being removable, as well as microlaser cavity mirrors (2, 4). A pumping beam (10) makes it possible to optically pump the cavity.

Abstract: A microlaser having input and output mirrors defining a microlaser cavity, a solid active dielectric medium disposed in the microlaser cavity, and a pumping mechanism which pumps the microlaser and which includes at least one vertical cavity semiconductor laser. The microlaser may also include a microoptical focusing device, passive and/or active cavity switches. A plurality of such microlasers can be assembled to form a bidimensional network.

Abstract: The invention relates to a device for an infrared light emitter comprising a semiconductor element (12) able to emit infrared radiation and a switched microlaser (2, 4, 6, 8) arranged so as to be able to optically pump the semiconductor element.

Abstract: The invention relates to a microlaser cavity switched with the aid of an electrooptical material (54). Electrodes (84, 86) are produced on support elements (80, 82) and the latter are then applied on either side of the electrooptical element. Solid electrodes can also be applied on either side of the electrooptical material.

Abstract: The invention relates to a remote gas detection process comprising: the emission of a first radiation (4), at at least one absorption wavelength for the gas to be detected, with the aid of a first switched microlaser, in the direction of a test area (6), the production of a first signal (S), representative of the radiation quantity scattered by said gas in response to the interaction between the molecules or atoms of said gas and said first radiation. The invention also relates to an apparatus for performing this process.

Abstract: The invention relates to a laser cavity having an active laser medium and two mirrors forming a Fabry-Perot cavity, characterized in that the cavity is at the optical stability limit and in that there are means for varying the optical length of the cavity, so as to pass from an optically unstable state into a stable state.

Abstract: A microlaser cavity to a microlaser incorporating an active solid medium (38) and means (44) for switching the cavity, whilst also having, within said cavity, at least one element (46) of an optically nonlinear material, making it possible to multiply the basic frequency of the laser cavity by a factor n (n.gtoreq.2).

Abstract: The invention relates to an optical parametric oscillator characterized in that it comprises an OPO nonlinear material (18) and two mirrors (24, 26) on either side of said nonlinear material and forming an OPO cavity and a switched microlaser (2, 6, 8, 26) for generating an OPO cavity laser pumping beam.

Abstract: A microoptical component including a microlens having a focal axis and a microbeam to which said microlens, is integrally fixed said microbeam extending along an axis substantially perpendicular to the focal axis of the microlens and undergoing elastic deformations along an axis substantially perpendicular to the focal axis of the microlens and to the axis along which the microbeam extends.

Abstract: The invention relates to a microlaser cavity having an active laser medium and reflection means at the entrance and exit of the cavity, characterized in that the reflection means are dimensioned in such a way that, in the active medium, the size of a pumping beam is at the most equal to the size of a laser beam emitted by the cavity.

Abstract: The invention relates to a microlaser cavity (10) having: a solid active medium (2) emitting at least in a wavelength range between 1.5 and 1.6 &mgr;m, and a saturable absorber (4) of formula CaF2:Co2+ or MgF2:Co2+ or SrF2:Co2+ or BaF2:Co2+ or La0.9Mg0.5-xCoxAl11.433O19 or YalO3:Co2+ (or YAl5-2xCoxSixO3 YAl(1-2x)CoxSixO3) or Y3Al5-x-yGaxScyO12:Co2+ (or -3Al5-x-y2zGaxScyCozSizO12 Y3Al5-x-y-2zGaxScyCozSizO12) or Y3-xLuxAl5O12:Co2+ (or Y3-xLuxAl5-2yCoySiyO3) or Sr1-xMgxLayAl12-yO12:Co2+ (or Sr1-xMgx-yCoyLazAl12-zO12, with 0<y<x) Sr1-xLaxMgxAl12-xO19:Co2+ (or Sr1-xLaxMgx-yCoyAl12-xO19 , with 0<y<x).