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Laser-Induced Dry Plasma Etching Disclosure Number: IPCOM000039329D
Original Publication Date: 1987-May-01
Included in the Prior Art Database: 2005-Feb-01

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Coufal, H Tam, A Zapka, W [+details]


Etching and micromachining of materials by means of an intense laser beam is improved if the process is carried out in a reactive gas atmosphere under the influence of an electric field which returns the reactive gas ions to the sample surface for ion and impact etching. In the figure, the sample to be etched, preferably a dielectric, is embedded between a conductive mask 2 and a counterelectrode 3 which are connected to a voltage source U0 to generate an electric field, e.g., in craters 4 formed under openings of mask 2. Mask 2 is homogeneously or selectively irradiated by a pulsed laser beam 5 with intensities of the order of 100 MW/cm2 which are sufficient to vaporize a surface layer of dielectric 1 and to heat the vaporized material into a plasma 6 having a high escape speed (plasma jet).