Commissariat a L'energie Atomique

Compagnie Generale D'electricite

Compagnie Generale D'electricite S.a.

Compagnie General D'electrocite S.a.

Maurice Michon

Genevieve Girard

Paul Rigny

Jean-Claude Farcy

Bernard Sturel

Apparatus for the distribution of laser beams used during a selective reaction in a process for isotope separation by lasers. The system comprises in an enclosure (10), a material in the form of a vapor flow, from which it is wished to extract one species, and laser sources (12) supplying pulses along beams S1 . . . Sn at selective excitation wavelengths .lambda.1 . . . .lambda.n and along a beam St at wavelength .lambda.t permitting a transforming of said excited species. The system incorporates partial reflection mirrors (Mi) arranged in such a way that the transmitted and reflected beams S1 . . . Sn, St are superimposed. A first part (P1) of these beams is directed to the enclosure and a second part (P2) to the mirror (Mi+1). Return means (14) make it possible to adjust the length of the path in enclosure (10) between two mirrors (Mi) and (Mi+1).

Apparatus for the distribution of laser beams used during a selective

A device for distributing laser beams used in an isotopic separation method. The plurality of laser beams S.sub.n used in the process; where n is a whole number at least equal to 2, are divided by means of a plurality of partially reflecting mirrors and superimposed by suitable dichroic mirrors. The superimposed beams, during several passages, are sent into a reaction chamber. When one of these beams has its fluence equal to the saturation fluence, a new part of the beam is superimposed onto the beams. This is accomplished by means of a suitable dichroic mirror. The interference between this new part and the residual beam having traversed the chamber are avoided. A specific application is for the isotopic separation of uranium vapor by laser beams.

Device for distributing laser beams used in an isotopic separation method

The invention relates to a system making it possible to obtain a selective reaction in photochemical processes from laser beams, comprising means for distributing said beams permitting a good utilization of the light energies. This system comprises in a sealed enclosure: the matter being in the state of a vapor from which it is wished to extract a chemical or isotopic species, laser sources emitting into said enclosure; a beam S.sub.1 permitting a selective excitation of the species to be extracted and a beam S.sub.2 permitting a transformation of said excited species. This system also comprises means for distributing the beams and incorporating means for superimposing the beams S'.sub.1 . . . S.sub.1.sup.(n) with n being an interger at least equal to 1 and for forming several beams S.sub.1 which it is wished to introduce at several points through the vapor to be treated, means for introducing beams S.sub.1 and beam S.sub.2 into the enclosure in such a way that their paths are different and means for inverting them along parallel arms. Application to the isotopic separation of an atom or molecule, or to the photoisomerization of a molecule.

System making it possible to obtain a selective reaction in

The cut-out device comprises a saturable absorbing medium and a monochromatic filter disposed between two amplifying media in the path of laser light pulses. The cut-out device forestalls amplification of light spontaneously emitting in one amplification medium by the following amplification medium, thereby reducing energy losses from pumped amplifying media prior to the passage of a laser pulse.

Wave-length selective cut-out device

The invention relates to a laser head and the application thereof to a laser generator device. The laser head comprises in particular a neodymium-doped glass rod, a light excitation source and laser rubies excited by this source, the beams emitted by the laser rubies being returned towards a zone of the glass rod which is insufficiently excited by the light source.

Laser head and application thereof to a laser generator device

Power laser chain. Two amplifying elements are separated by a linear polarizer placed between two polarization transformers such as a quarter wave plate or a Fresnel parallelepiped, this preventing auto-oscillators in the amplifying chain, it being possible to repeat that sequence several times in the chain.

Power laser chain

Gaseous flux laser generator comprising a nozzle for injecting a gas into an enclosure, two main electrodes for setting up a discharge in that enclosure and two auxiliary electrodes arranged at the output of the nozzle for ionizing the injected gas.

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Draveil, France

Maurice Michon