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Excimer laser ablation method and apparatus for microcircuit fabrication

  • US 5,018,164 A
  • Filed: 09/12/1989
  • Issued: 05/21/1991
  • Est. Priority Date: 09/12/1989
  • Status: Expired due to Term
First Claim
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1. A laser ablation method comprising the steps of:

  • (a) providing a solid material including at least two constituents which are ablated from the material in response to laser beam irradiation of a predetermined wavelength at respective rate which vary unequally as functions of irradiation fluence;

    (b) predetermining said functions;

    (c) selecting a desired proportion between the rates at which said constituents are to be ablated;

    (d) irradiating the material with a laser beam of the predetermined wavelength;

    (e) setting the fluence of said laser beam in accordance with said functions to a level which is greater than an ablation fluence threshold of the material and which causes the constituents to be ablated from the material at rates which are in said selected proportion to each other; and

    (f) causing predetermined relative movement between the laser beam and the material such that a predetermined pattern corresponding to the predetermined relative movement is formed in a selected area of the material by ablation.

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