Scanning technique for laser ablation
AssigneeBausch & Lomb Incorporated
InventorKenneth L. Opdyke
Life of this patent
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Abstract
Improved methods for modifying target surfaces through ablation which result in a reduction of ablation debris redeposition on the target surface are disclosed.
Claims16
A method for ablatively modifying a target surface while avoiding ablative debris accumulation comprising the steps of a) directing a beam of pulsed UV radiation at the point of the target surface where the least amount of material is to be removed;
- and b) scanning the beam in the direction toward the portion of the target surface where the greatest amount of material is to be removed.
A method for ablatively modifying a target surface while avoiding ablative debris accumulation comprising the steps of a) directing a beam of pulsed UV radiation at the edge of the target surface;
- b) scanning said beam in a direction toward and stopping at a bisecting line of the target surface;
- c) rotating the target 180 degrees;
- d) returning the beam to the beam position of step a) which is now the opposing edge of the target surface;
- and e) scanning the beam in a direction toward and stopping at said bisecting line such that the entire target surface is scanned.
A method for ablatively modifying a target surface while avoiding ablative debris accumulation comprising the steps of a) directing a beam of pulsed UV radiation at a first edge of a target surface;
- b) scanning said beam in a direction toward and stopping at a bisecting line on said target surface;
- c) inactivating said beam;
- d) directing said beam at the edge directly opposing said first edge;
- e) reactivating said beam;
- f) scanning said beam in a direction from said opposing edge toward and stopping at said bisecting line such that the entire target surface has been scanned.
Dependencies are inferred from the claim text.