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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 37, Iss. 16 — Jun. 1, 1998
  • pp: 3398–3400

Rayleigh Range and the M2 Factor for Bessel–Gauss Beams

R. M. Herman and T. A. Wiggins  »View Author Affiliations


Applied Optics, Vol. 37, Issue 16, pp. 3398-3400 (1998)
http://dx.doi.org/10.1364/AO.37.003398


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Abstract

The M2 factor of Bessel–Gauss beams derived by Borghi and Santarsiero [Opt. Lett. 22, 262–264 (1997)] is shown to predict the e−2 axial position rather than the half-intensity position of the on-axis intensity as the Rayleigh range divided byM2 for large values of ktw0. For small values of ktw0, the half-intensity axial position of the J0 Bessel–Gauss beam is the Rayleigh range divided by M2. Also, the ratio of the half-intensity lengths of J0 Bessel–Gauss and comparable Gaussian beams having the same radial size of their central regions is shown to be M2/1.3. For equal input powers and largektw0, the values of peak intensity times effective range for J0Bessel–Gauss beams is a constant and is a factor of 1.3 larger than the corresponding product for the comparable simple Gaussianbeam.

© 1998 Optical Society of America

OCIS Codes
(050.1940) Diffraction and gratings : Diffraction
(350.5500) Other areas of optics : Propagation

Citation
R. M. Herman and T. A. Wiggins, "Rayleigh Range and the M2 Factor for Bessel–Gauss Beams," Appl. Opt. 37, 3398-3400 (1998)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-37-16-3398


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