Optical and Quantum Electronics

, Volume 24, Issue 9, pp S1129–S1135 | Cite as

Beamwidths of a diffracted laser using four proposed methods

  • D. Wright
Invited Paper


The International Organization for Standardization has been preparing test methods for laser beamwidth and propagation factors. Several techniques have been proposed. The purpose of this paper is to compare the results of applying the various proposed definitions and measurement methods to the same diffracted beam. A heavily apertured laser beam is passed through a focusing lens; the beamwidth is measured at several locations on each side of the focus. The apparent beamwidth is calculated using the diameter that passes 86.5% of the light, the knife edge, the slit and the second moment methods of beamwidth measurement.


  1. 1.
    S. GUGGENHIEMER and D. L. WRIGHT,SPIE Proceedings, Laser Beam Diagnostics (January 1991).Google Scholar
  2. 2.
    A. E. SIEGMAN, Proceedings SPEI/OELASE Meeting, January 1990.Google Scholar
  3. 3.
    M. W. SASNETT, inThe Physics and Technology of Lasers, edited by D. R. Hall and P. E. Jackson (Hilger, New York, 1989).Google Scholar
  4. 4.
    L. D. DICKSON,Appl. Opt. 19 (1970).Google Scholar

Copyright information

© Chapman & Hall 1992

Authors and Affiliations

  • D. Wright
    • 1
  1. 1.Spectra Physics LasersMountain ViewUSA

Personalised recommendations