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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. 19, Iss. 2 — Feb. 1, 2002
  • pp: 339–344

Spectral changes and 1 × N spectral switches in the diffraction of partially coherent light by an aperture

Jixiong Pu and Shojiro Nemoto  »View Author Affiliations


JOSA A, Vol. 19, Issue 2, pp. 339-344 (2002)
http://dx.doi.org/10.1364/JOSAA.19.000339


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Abstract

The off-axis and on-axis spectra in the far zone of an aperture for the case in which a particular class of partially coherent light with a broad spectrum is diffracted by an aperture are studied. It is shown that the spectrum in the far zone is generally different from that at the aperture; i.e., the spectrum is split into two or more peaks. Moreover, the spectrum varies with the diffractive angle. For a fixed diffractive angle, the spectral shift, defined as the difference between the frequencies at which the observed spectrum and the spectrum at the aperture take their maximum, shows a gradual change with the change in the coherence at the aperture. However, as the coherence reaches some critical values, the spectral shift exhibits a rapid transition; i.e., spectral switch occurs. The coherence that causes the spectral switch to take place is different for different diffractive angles. Therefore we propose a new kind of 1×N spectral switch, where N detectors (output ports) are placed at different diffractive angles in the far zone, and the spectral shifts at different detectors are measured. By adjusting the coherence of the aperture (input port) to the desired values, we obtain a rapid transition of the spectral shift in the desired output ports.

© 2002 Optical Society of America

OCIS Codes
(030.1640) Coherence and statistical optics : Coherence
(230.6080) Optical devices : Sources
(260.1960) Physical optics : Diffraction theory

History
Original Manuscript: June 18, 2001
Revised Manuscript: August 20, 2001
Manuscript Accepted: August 20, 2001
Published: February 1, 2002

Citation
Jixiong Pu and Shojiro Nemoto, "Spectral changes and 1 × N spectral switches in the diffraction of partially coherent light by an aperture," J. Opt. Soc. Am. A 19, 339-344 (2002)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-19-2-339

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