Electric heating – Metal heating – By arc
Patent
1976-01-09
1978-03-07
Truhe, J. V.
Electric heating
Metal heating
By arc
B23K 900
Patent
active
040781640
ABSTRACT:
A process for deep micro-engraving of a material includes the steps of superpositioning a plurality of elementary layers of respectively alternating indices on the material. Each of the layers is individually transparent to a predetermined wavelength in vacuum, and has an optical thickness equal to one quarter of the predetermined wavelength. The process further includes forming a plurality of openings in the elementary layers; the openings correspond to regions to be engraved on the material, and uncover selected portions of the material. The material is then illuminated by a laser beam of sufficient power to engrave, by sublimation, the uncovered material portions. The laser has the predetermined wavelength, and the plurality of layers form a mirror for the laser beam, which have a relatively high threshold of damage from the laser, and absorb substantially no power from the laser beam.
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Summer Course in Modern Methods of Optical Design, (Notes on Multilayer Optical Filters), P. Baumeister, 1961.
Pelletier Jacques
Rinchet Francois
Agence Nationale de Valorisation de la Recherche (ANVAR)
Bell Fred E.
Truhe J. V.
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