Process for the accomplishment of deep microengraving by a laser

Details Process for the accomplishment of deep microengraving by a laser Process for the accomplishment of deep microengraving by a laser

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.

REFERENCES:
patent: 3154371 (1964-10-01), Johnson
patent: 3181170 (1965-04-01), Akin
patent: 3410979 (1968-11-01), Larsson
patent: 3435186 (1969-03-01), Roshon, Jr. et al.
patent: 3553421 (1971-01-01), Schawlow
patent: 3560291 (1971-02-01), Foglia et al.
patent: 3665483 (1972-05-01), Becker et al.
patent: 3790744 (1974-02-01), Bowen
patent: 3832948 (1974-09-01), Barker
Summer Course in Modern Methods of Optical Design, (Notes on Multilayer Optical Filters), P. Baumeister, 1961.

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