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Propagation characteristics of a diffracted [M.sup.2] beam

Authors :
Amano, Sho
Mochizuki, Takayasu
Source :
Applied Optics. Oct 20, 2002, Vol. 41 Issue 30, p6325, 7 p.
Publication Year :
2002

Abstract

The propagation characteristics of a beam diffracted by a circular aperture are investigated. The beam-quality factor [M.sup.2] defined by an 86.5% power-content radius is given theoretically and experimentally as a function of the truncation ratio. It is found that the theoretical limit of [M.sup.2] is 2.37 times as great as that of an incident beam as the truncation ratio approaches 0. For a weakly diffracted beam a simple formula giving [M.sup.2] is derived. Although [M.sup.2] does not increase much with diffraction, the influence of diffraction should be taken into account in beam brightness. OCIS codes: 260.1960, 000.4430, 030.4070, 050.1220.

Details

ISSN :
1559128X
Volume :
41
Issue :
30
Database :
Gale General OneFile
Journal :
Applied Optics
Publication Type :
Academic Journal
Accession number :
edsgcl.93458140