Centre National De La Recherche Scientifique

Etat Francais Represente Par Le Ministere Des Postes

Serge Saada

Patrick Chollet

Emile Bloyet

Philippe LePrince

Jean Marec

Philippe Leprince

Jacques Migne

Monique Moisan

Marie-Eve Davoust

Dominique Pavy

Plasma reactor

It realizes the chemical vapour phase deposition method using a plasma maintained by surface waves in a tube (2) for obtaining a preform and comprises photodetection means (50) sensitive to the light emitted by the deposition area (54) of the vitreous coating resulting from the reaction between appropriate gaseous compounds and able to supply information relative to the emission area of said light, and means (52) for controlling the displacement of the deposition area, displacement being such that the thickness of the coating is uniform in the tube, and control means controlling the power of the microwave generator (30) of the apparatus as a function of the information. Application to the field of telecommunications.

Apparatus for the production of preforms for optical fibers

A waveguide (130) is coupled to a tubular member (2) by a gap (139) suitable for generating an intense surface wave in a gaseous mixture contained in the tubular member (2). Short circuits (110 and 120) delimit the plasma, thereby generating very high intensity standing microwaves, which increase the energy density of the plasma. An ion laser effect can then be observed, in particular in a mixture of argon and helium, together with optional krypton.

Apparatus for exciting a plasma in a column of gas by means of

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Kremlin-Bicetre, France

Serge Saada