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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 21, Iss. 11 — Jun. 1, 1982
  • pp: 1989–1994

Focal shift and concept of effective Fresnel number for a Gaussian laser beam

William H. Carter  »View Author Affiliations


Applied Optics, Vol. 21, Issue 11, pp. 1989-1994 (1982)
http://dx.doi.org/10.1364/AO.21.001989


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Abstract

The actual focal plane for a laser beam under frequently encountered conditions is shifted from the plane given by geometrical optics. The concept of effective Fresnel number for an unapertured Gaussian laser beam is defined and used to examine focal shifts. It is found that the effective Fresnel number has a simple physical interpretation that makes clear its relationship to the focal shift phenomena. Expressions are obtained that relate the important Gaussian beam parameters to the effective Fresnel number, and a method of correcting for the focal shift in optical systems design is described.

© 1982 Optical Society of America

History
Original Manuscript: February 19, 1982
Published: June 1, 1982

Citation
William H. Carter, "Focal shift and concept of effective Fresnel number for a Gaussian laser beam," Appl. Opt. 21, 1989-1994 (1982)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-21-11-1989

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