Patents Examined by Allen Ho
  • Patent number: 6307913
    Abstract: A shaped plasma discharge system is provided in which a shaped radiation source emits radiation at a desired frequency and in a desired shape. In one embodiment, a laser source provides an output beam at a desired intensity level to shaping optics. The shaping optics alters the output beam into a desired shaped illumination field. In an alternate embodiment, plural laser sources provide plural output beams and the shaping optics can produce a compound illumination field. The illumination field strikes a target material forming a plasma of the desired shape that emits radiation with a desired spatial distribution, at a desired wavelength, preferably in the x-ray, soft x-ray, extreme ultraviolet or ultraviolet spectra. In another embodiment an electric discharge generates the required shaped radiation field. The shaped emitted radiation proceeds through an optical system to a photoresist coated wafer, imprinting a pattern on the wafer.
    Type: Grant
    Filed: October 27, 1999
    Date of Patent: October 23, 2001
    Assignee: Jmar Research, Inc.
    Inventors: Richard M. Foster, Edmond Turcu, Jose M. Sasian, Harry Rieger, James H. Morris