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Title: Method to reduce damage to backing plate

Abstract

The present invention is a method for penetrating a workpiece using an ultra-short pulse laser beam without causing damage to subsequent surfaces facing the laser. Several embodiments are shown which place holes in fuel injectors without damaging the back surface of the sack in which the fuel is ejected. In one embodiment, pulses from an ultra short pulse laser remove about 10 nm to 1000 nm of material per pulse. In one embodiment, a plasma source is attached to the fuel injector and initiated by common methods such as microwave energy. In another embodiment of the invention, the sack void is filled with a solid. In one other embodiment, a high viscosity liquid is placed within the sack. In general, high-viscosity liquids preferably used in this invention should have a high damage threshold and have a diffusing property.

Inventors:
 [1];  [1];  [2]
  1. (Livermore, CA)
  2. (Fremont, CA)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
OSTI Identifier:
874059
Patent Number(s):
US 6303901
Assignee:
The Regents of the University of California (Oakland, CA) LLNL
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; reduce; damage; plate; penetrating; workpiece; ultra-short; pulse; laser; beam; causing; subsequent; surfaces; facing; embodiments; shown; holes; fuel; injectors; damaging; surface; sack; ejected; embodiment; pulses; ultra; remove; 10; nm; 1000; material; plasma; source; attached; injector; initiated; common; methods; microwave; energy; void; filled; solid; viscosity; liquid; placed; high-viscosity; liquids; threshold; diffusing; property; laser beam; microwave energy; fuel injector; pulse laser; /219/

Citation Formats

Perry, Michael D., Banks, Paul S., and Stuart, Brent C. Method to reduce damage to backing plate. United States: N. p., 2001. Web.
Perry, Michael D., Banks, Paul S., & Stuart, Brent C. Method to reduce damage to backing plate. United States.
Perry, Michael D., Banks, Paul S., and Stuart, Brent C. Mon . "Method to reduce damage to backing plate". United States. https://www.osti.gov/servlets/purl/874059.
@article{osti_874059,
title = {Method to reduce damage to backing plate},
author = {Perry, Michael D. and Banks, Paul S. and Stuart, Brent C.},
abstractNote = {The present invention is a method for penetrating a workpiece using an ultra-short pulse laser beam without causing damage to subsequent surfaces facing the laser. Several embodiments are shown which place holes in fuel injectors without damaging the back surface of the sack in which the fuel is ejected. In one embodiment, pulses from an ultra short pulse laser remove about 10 nm to 1000 nm of material per pulse. In one embodiment, a plasma source is attached to the fuel injector and initiated by common methods such as microwave energy. In another embodiment of the invention, the sack void is filled with a solid. In one other embodiment, a high viscosity liquid is placed within the sack. In general, high-viscosity liquids preferably used in this invention should have a high damage threshold and have a diffusing property.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2001},
month = {1}
}

Patent:

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