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Title: Method and apparatus for precision laser micromachining

Abstract

A method and apparatus for micromachining and microdrilling which results in a machined part of superior surface quality is provided. The system uses a near diffraction limited, high repetition rate, short pulse length, visible wavelength laser. The laser is combined with a high speed precision tilting mirror and suitable beam shaping optics, thus allowing a large amount of energy to be accurately positioned and scanned on the workpiece. As a result of this system, complicated, high resolution machining patterns can be achieved. A cover plate may be temporarily attached to the workpiece. Then as the workpiece material is vaporized during the machining process, the vapors condense on the cover plate rather than the surface of the workpiece. In order to eliminate cutting rate variations as the cutting direction is varied, a randomly polarized laser beam is utilized. A rotating half-wave plate is used to achieve the random polarization. In order to correctly locate the focus at the desired location within the workpiece, the position of the focus is first determined by monitoring the speckle size while varying the distance between the workpiece and the focusing optics. When the speckle size reaches a maximum, the focus is located at the firstmore » surface of the workpiece. After the location of the focus has been determined, it is repositioned to the desired location within the workpiece, thus optimizing the quality of the machined area.« less

Authors:
; ;
Publication Date:
Sponsoring Org.:
US Department of Energy
OSTI Identifier:
20050910
Alternate Identifier(s):
OSTI ID: 20050910
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Resource Relation:
Other Information: PBD: 2 May 2000
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; MINIATURIZATION; LASER BEAM MACHINING; LASER DRILLING; MACHINE TOOLS; VISIBLE RADIATION; LASERS; BEAM OPTICS; OPTICAL SYSTEMS

Citation Formats

Chang, J., Warner, B.E., and Dragon, E.P. Method and apparatus for precision laser micromachining. United States: N. p., 2000. Web.
Chang, J., Warner, B.E., & Dragon, E.P. Method and apparatus for precision laser micromachining. United States.
Chang, J., Warner, B.E., and Dragon, E.P. Tue . "Method and apparatus for precision laser micromachining". United States.
@article{osti_20050910,
title = {Method and apparatus for precision laser micromachining},
author = {Chang, J. and Warner, B.E. and Dragon, E.P.},
abstractNote = {A method and apparatus for micromachining and microdrilling which results in a machined part of superior surface quality is provided. The system uses a near diffraction limited, high repetition rate, short pulse length, visible wavelength laser. The laser is combined with a high speed precision tilting mirror and suitable beam shaping optics, thus allowing a large amount of energy to be accurately positioned and scanned on the workpiece. As a result of this system, complicated, high resolution machining patterns can be achieved. A cover plate may be temporarily attached to the workpiece. Then as the workpiece material is vaporized during the machining process, the vapors condense on the cover plate rather than the surface of the workpiece. In order to eliminate cutting rate variations as the cutting direction is varied, a randomly polarized laser beam is utilized. A rotating half-wave plate is used to achieve the random polarization. In order to correctly locate the focus at the desired location within the workpiece, the position of the focus is first determined by monitoring the speckle size while varying the distance between the workpiece and the focusing optics. When the speckle size reaches a maximum, the focus is located at the first surface of the workpiece. After the location of the focus has been determined, it is repositioned to the desired location within the workpiece, thus optimizing the quality of the machined area.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2000},
month = {5}
}