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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Vol. 5, Iss. 7 — Jul. 1, 1988
  • pp: 1118–1126

Changes in the spectrum of a partially coherent light beam propagating in free space

Zagorka Dačić and Emil Wolf  »View Author Affiliations


JOSA A, Vol. 5, Issue 7, pp. 1118-1126 (1988)
http://dx.doi.org/10.1364/JOSAA.5.001118


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Abstract

The effect of spatial coherence of a source on the spectrum of the emitted light is studied for a class of beamlike fields. The source is assumed to be planar, secondary, and quasi-homogeneous. We consider in detail the situation in which the source spectrum is a line with a Gaussian profile and the degree of spectral coherence is characterized by a Gaussian distribution. The changes that the spectrum undergoes as the emitted light propagates from the source plane to the far zone are illustrated by computed curves. Two factors are shown to contribute to changes in the spectrum: effects due to the finite size of the source, which tend to shift the emitted spectral line toward the shorter wavelengths (a blue shift), and effects due to source correlations, which tend to shift the line toward longer wavelengths (a red shift). The magnitude of the resulting shift in the far zone depends on the direction of observation. These results are in qualitative agreement with the recent experimental observations of Faklis and Morris [ Opt. Lett. 13, 4 ( 1988)].

© 1988 Optical Society of America

History
Original Manuscript: August 19, 1987
Manuscript Accepted: February 2, 1988
Published: July 1, 1988

Citation
Zagorka Dačić and Emil Wolf, "Changes in the spectrum of a partially coherent light beam propagating in free space," J. Opt. Soc. Am. A 5, 1118-1126 (1988)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-5-7-1118

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