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| United States Patent |
6,414,320
|
|
Ishikawa
, et al.
|
July 2, 2002
|
Composition analysis by scanning femtosecond laser ultraprobing (CASFLU).
Abstract
The composition analysis by scanning femtosecond ultraprobing (CASFLU)
technology scans a focused train of extremely short-duration, very intense
laser pulses across a sample. The partially-ionized plasma ablated by each
pulse is spectrometrically analyzed in real time, determining the ablated
material's composition. The steering of the scanned beam thus is computer
directed to either continue ablative material-removal at the same site or
to successively remove nearby material for the same type of composition
analysis. This invention has utility in high-speed chemical-elemental,
molecular-fragment and isotopic analyses of the microstructure composition
of complex objects, e.g., the oxygen isotopic compositions of large
populations of single osteons in bone.
| Inventors:
|
Ishikawa; Muriel Y. (Livermore, CA);
Wood; Lowell L. (Simi Valley, CA);
Campbell; E. Michael (Danveille, CA);
Stuart; Brent C. (Livermore, CA);
Perry; Michael D. (Livermore, CA)
|
| Assignee:
|
The Regents of the University of California (Oakland, CA)
|
| Appl. No.:
|
563122 |
| Filed:
|
May 2, 2000 |
| Current U.S. Class: |
250/425; 250/423R; 250/492.1; 250/251; 250/288; 219/121.6; 219/121.68; 216/65; 606/11 |
| Intern'l Class: |
B23K 026/00; B23K 026/32 |
| Field of Search: |
250/425,423 R,492.1,251,288
219/121.6,121.68
216/65
606/11
|
References Cited
U.S. Patent Documents
| 5720894 | Feb., 1998 | Neev et al. | 216/65.
|
| 6156030 | Dec., 2000 | Neev | 606/10.
|
| 6333485 | Dec., 2001 | Haight et al. | 219/121.
|
| Foreign Patent Documents |
| WO 98/55035 | Dec., 1998 | WO.
| |
Other References
Database Inspec 'Online, Institute of Electrical Engineers, Stevenage,
Banerjee S. et al: "Highly Charged Ion Production by Intense, Ultrashore
Laser Pulse Excitation of Solids" Database accession No. 6413618;
XP-000911864.
|
Primary Examiner: Anderson; Bruce
Assistant Examiner: Wells; Nikita
Attorney, Agent or Firm: Wooldridge; John P., Thompson; Alan H.
Goverment Interests
The U.S. Government has rights in this invention pursuant to Contract No.
W-7405-ENG-48 between the United States Department of Energy and the
University of California for the operation of Lawrence Livermore National
Laboratory.
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