OSA's Digital Library

Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 39, Iss. 33 — Nov. 20, 2000
  • pp: 6136–6143

Preparation of fiber optics for the delivery of high-energy high-beam-quality Nd:YAG laser pulses

Andreas Kuhn, Paul French, Duncan P. Hand, Ian J. Blewett, Mark Richmond, and Julian D. C. Jones  »View Author Affiliations


Applied Optics, Vol. 39, Issue 33, pp. 6136-6143 (2000)
http://dx.doi.org/10.1364/AO.39.006136


View Full Text Article

Enhanced HTML    Acrobat PDF (1239 KB)





Browse Journals / Lookup Meetings

Browse by Journal and Year


   


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Article Tools

Share
Citations

Abstract

Recent improvements in design have made it possible to build Nd:YAG lasers with both high pulse energy and high beam quality. These lasers are particularly suited for percussion drilling of holes of as much as 1-mm diameter thick (a few millimeters) metal parts. An example application is the production of cooling holes in aeroengine components for which 1-ms duration, 30-J energy laser pulses produce holes of sufficient quality much more efficiently than with a laser trepanning process. Fiber optic delivery of the laser beam would be advantageous, particularly when one is processing complex three-dimensional structures. However, lasers for percussion drilling are available only with conventional bulk-optic beam delivery because of laser-induced damage problems with the small-diameter (approximately 200–400-µm) fibers that would be required for preserving necessary beam quality. We report measurements of beam degradation in step-index optical fibers with an input beam quality corresponding to an M2 of 22. We then show that the laser-induced damage threshold of 400-µm core-diameter optical fibers can be increased significantly by a CO2 laser treatment step following the mechanical polishing routine. This increase in laser-induced damage threshold is sufficient to propagate 25-J, 1-ms laser pulses with a 400-µm core-diameter optical fiber and an output M2 of 31.

© 2000 Optical Society of America

OCIS Codes
(060.2270) Fiber optics and optical communications : Fiber characterization
(060.2300) Fiber optics and optical communications : Fiber measurements
(060.2310) Fiber optics and optical communications : Fiber optics
(060.2400) Fiber optics and optical communications : Fiber properties
(140.3390) Lasers and laser optics : Laser materials processing
(140.3530) Lasers and laser optics : Lasers, neodymium

History
Original Manuscript: November 18, 1999
Revised Manuscript: August 2, 2000
Published: November 20, 2000

Citation
Andreas Kuhn, Paul French, Duncan P. Hand, Ian J. Blewett, Mark Richmond, and Julian D. C. Jones, "Preparation of fiber optics for the delivery of high-energy high-beam-quality Nd:YAG laser pulses," Appl. Opt. 39, 6136-6143 (2000)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-39-33-6136


Sort:  Author  |  Year  |  Journal  |  Reset  

References

  1. G. Bostanjoglo, I. Saraday, T. Beck, H. Weber, “Processing of Ni-based aero engine components with repetitively Q-switched Nd:YAG lasers,” in High-Power Lasers: Applications and Emerging Applications, M. R. Osborne, G. Sayegh, eds., Proc. SPIE2789, 145–157 (1996).
  2. R. M. Wood, “Summary of the factors affecting the power and energy capabilities of optical fibres,” in Laser Techniques for Surface Science II, J. M. Hicks, W. Ho, H.-L. Dai, eds., Proc. SPIE2870, 457–467 (1996).
  3. R. E. Setchell, “An optimized fiber delivery system for Q-switched, Nd:YAG lasers,” in Laser-Induced Damage in Optical Materials: 1996, H. E. Bennett, A. H. Guenther, M. R. Kozlowski, B. E. Newnam, M. J. Soileau, eds., Proc. SPIE2966, 608–619 (1996).
  4. B. C. Stuart, S. Herman, M. D. Perry, “Laser-induced damage in dielectrics with nanosecond to subpicosecond pulses. I. Experimental,” in Laser-Induced Damage in Optical Materials: 1994, H. E. Bennett, A. H. Guenther, M. R. Kozlowski, B. E. Newnam, M. J. Soileau, eds., Proc. SPIE2428, 568–576 (1994).
  5. D. Su, A. A. P. Boechat, J. D. C. Jones, “Beam delivery by large-core fibers: effect of launching conditions on near-field output profile,” Appl. Opt. 31, 5816–5821 (1992). [CrossRef] [PubMed]
  6. M. W. Sasnett, “Propagation of multimode laser beams—the M2 factor,” in The Physics and Technology of Laser Resonators, D. R. Hall, P. E. Jackson, eds. (Adam Hilger, Bristol, UK, 1989).
  7. T. Beck, G. Bostanjoglo, N. Kugler, K. Richter, H. Weber, “Laser beam drilling applications in novel materials for the aircraft industry,” in Proceedings of ICALEO ’97, R. Fabbro, A. Kar, A. Matsunawa, eds. (Laser Institute of America, Orlando, Fla., 1997), Sec. E, pp. 93–102.
  8. R. M. Wood, Laser Damage in Optical Materials (Adam Hilger, Bristol, UK, 1986).
  9. D. W. Camp, M. R. Kozlowski, L. M. Sheehan, M. Nichols, M. Dovik, R. Raether, I. Thomas, “Subsurface damage and polishing compound affect the 355-nm laser damage threshold of fused silica surfaces,” in Laser-Induced Damage in Optical Materials: 1997, G. J. Exarhos, A. H. Guenther, M. R. Kozlowski, M. J. Soileau, eds., Proc. SPIE3244, 356–364 (1998).
  10. P. A. Temple, W. H. Lowdermilk, D. Milam, “Carbon dioxide laser polishing of fused silica surfaces for increased laser-damage resistance at 1064 nm,” Appl. Opt. 21, 3249–3255 (1982). [CrossRef] [PubMed]
  11. R. E. Setchell, P. Klingsporn, “Laser-induced damage studies on step-index, multimode fibers,” in Laser-Induced Damage in Optical Materials: 1991, H. E. Bennett, L. L. Chase, A. H. Guenther, B. E. Newnam, M. J. Soileau, eds., Proc. SPIE1624, 56–66 (1991).
  12. F. Vega, N. Lupón, J. A. Cebrian, F. Laguarta, “Laser application for optical glass polishing,” Opt. Eng. 37, 272–279 (1998). [CrossRef]
  13. R. E. Setchell, “Laser-induced damage in step-index, multimode fibers,” in Laser-Induced Damage in Optical Materials: 1992, H. E. Bennett, L. L. Chase, A. H. Guenther, B. E. Newnam, M. J. Soileau, eds., Proc. SPIE1848, 15–23 (1991).
  14. D. Kitriotis, L. D. Merkle, “Multiple laser-induced damage phenomena in silicates,” Appl. Opt. 28, 949–956 (1989). [CrossRef] [PubMed]

Cited By

Alert me when this paper is cited

OSA is able to provide readers links to articles that cite this paper by participating in CrossRef's Cited-By Linking service. CrossRef includes content from more than 3000 publishers and societies. In addition to listing OSA journal articles that cite this paper, citing articles from other participating publishers will also be listed.


« Previous Article  |  Next Article »

OSA is a member of CrossRef.

CrossCheck Deposited