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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 39, Iss. 36 — Dec. 20, 2000
  • pp: 6754–6760

Beam quality after propagation of Nd:YAG laser light through large-core optical fibers

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


Applied Optics, Vol. 39, Issue 36, pp. 6754-6760 (2000)
http://dx.doi.org/10.1364/AO.39.006754


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Abstract

Laser beam characteristics are altered during propagation through large-core optical fibers. The distribution of modes excited by the input laser beam is modified by means of mode coupling on transmission through the fiber, leading to spatial dispersion of the profile and, ultimately and unavoidably, to degradation in the quality of the delivered beam unless the beam is spatially filtered with consequent power loss. Furthermore, a mismatch between the intensity profile of a typical focused high-power laser beam and the profile of the step-index fiber gives rise to additional beam-quality degradation. Modern materials processing applications demand ever higher delivered beam qualities (as measured by a parameter such as M2) to achieve greater machining precision and efficiency, a demand that is currently in conflict with the desire to utilize the convenience and flexibility of large-core fiber-optic beam delivery. We present a detailed experimental investigation of the principal beam-quality degradation effects associated with fiber-optic beam delivery and use numerical modeling to aid an initial discussion of the causes of such degradation.

© 2000 Optical Society of America

OCIS Codes
(000.4430) General : Numerical approximation and analysis
(060.2270) Fiber optics and optical communications : Fiber characterization
(060.2300) Fiber optics and optical communications : Fiber measurements
(140.3390) Lasers and laser optics : Laser materials processing
(140.3530) Lasers and laser optics : Lasers, neodymium

History
Original Manuscript: November 2, 1999
Revised Manuscript: August 28, 2000
Published: December 20, 2000

Citation
Andreas Kuhn, Ian J. Blewett, Duncan P. Hand, and Julian D. C. Jones, "Beam quality after propagation of Nd:YAG laser light through large-core optical fibers," Appl. Opt. 39, 6754-6760 (2000)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-39-36-6754

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