Process for producing an intensity distribution over a working laser beam and a device for this purpose
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United States of America Patent
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Oct 8, 2002
Grant Date -
N/A
app pub date -
Jul 11, 2000
filing date -
Jul 12, 1999
priority date (Note) -
Expired
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Abstract
In a process for producing a stipulated intensity distribution of a working laser beam on an object surface, at least one first and one second component beam with a stipulated first and second intensity distribution are formed and the power of each component beam is changed in a controlled manner with switching times down to submicroseconds. The component beams at a third intensity distribution superimposed as the working beam are pointed at or into the object in order to achieve a different action as a result of a varied third intensity distribution of the working beam. In contrast to conventional processes the first intensity distribution I.sub.b =a.times.f.sub.b (x, y, t) differs from the following one I.sub.n =a.times.f.sub.n (x, y, t) by the value of the function f.sub.u (x, y, t) and no longer only by an altered linear value a. The process as claimed in the invention can be preferably used in the production of screen cells on an engraved cylinder.
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