Commissariat a L'energie Atomique

Etat Francais

Etat Francais Represente Par Le Delegue General Pour L'armement

Bernard Rolland

Bernard Bechevet

Jean Dijon

Etienne Quesnel

Aime Perrin

Bruno Valon

Jean-Yves Robic

Didier Challeton

Claude Calvat

Bruno Vallon

The invention relates to a multilayer stack of fluoride materials usable in optics and its production process. This stack is constituted by alternating layers of a first, high index, fluoride material such as YF.sub.3 and a second, low index fluoride material such as LiF, able to form together a specific, stable compound such as YLiF.sub.4, so that the interface between two adjacent layers of the stack is at least partly formed from said compound.

Multilayer stack of fluoride materials usable in optics and its

The invention relates to a microwave antenna having at least one tubular portion with a central axis, and magnets which are located within the tubular portion along the central axis. The magnets generate a magnetic field in the vicinity of the antenna, with each end of each magnet facing an end having the same polarity of an immediately adjacent magnet. This type of antenna is used in the manufacture of microtips on large surfaces.

Cylindrical antenna having means for generating a magnetic field in a

Method for preparing a magneto optic memory comprising on a support (22), such as one made of glass, metal or a plastic material, a planar sensitive film (21) of magneto optic material for receiving at each point the recording of one of the two binary digits 0 and 1 in the form of small domains juxtaposed and magnetized perpendicular to the plane of the film in one of the two possible directions with respect to the latter, the sensitive film (21) being deposited by a cathodic or other evporation process of a magentic oxide selected from the group including spinel ferrites, hexaferrites and ferrimagnetic garnets, the preceding deposition being followed by a crystallization of the amorphous regions of said film with the aid of an annealing, wherein at least one reflective film (28) and/or one film constituting a thermal screen is inserted between the support (22) and the sensitive film (21) and wherein the annealing is a fast annealing, namely of a few seconds at a temperature of between 600.degree. C. and 650.degree. C.

Method for preparing a magneto optic memory

A heat transmission apparatus is formed between a thermal source (12) and an object (21) in a vacuum enclosure (1) by placing in a cavity defined by a heat emission wall (20) and the object (21), a granular material (30) which adapts to the thermal expansions, while permitting heating by conductivity under very good conditions. Possible application to the manufacture of semiconductors and the crystallization of thin films.

Apparatus for transmitting heat under vacuum by grains

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Meylan, France

Bernard Rolland