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Propagation characteristics of a diffracted [M.sup.2] beam
- 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.
- Subjects :
- Diffraction patterns -- Analysis
Beam optics -- Research
Astronomy
Physics
Subjects
Details
- ISSN :
- 1559128X
- Volume :
- 41
- Issue :
- 30
- Database :
- Gale General OneFile
- Journal :
- Applied Optics
- Publication Type :
- Academic Journal
- Accession number :
- edsgcl.93458140