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Decrease in spatial coherence of light propagating in free space.

A J Devaney1, A T Friberg, A T Kumar

  • 1Department of Electrical and Computer Engineering, Northeastern University, 360 Huntington Avenue, Boston, Massachusetts 02115, USA.

Optics Letters
|January 12, 2008
PubMed
Summary
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Scientists can now create spatially incoherent light from coherent light. This finding inverts the classic van Cittert-Zernike theorem and shows phase conjugation can restore light coherence.

Area of Science:

  • * Optics
  • * Optical Coherence Theory
  • * Wave Propagation

Background:

  • * The van Cittert-Zernike theorem describes how coherence changes with propagation.
  • * Understanding light coherence is crucial for many optical applications.

Purpose of the Study:

  • * To demonstrate the inverse of the van Cittert-Zernike theorem.
  • * To explore methods for controlling light coherence during propagation.
  • * To investigate the role of phase conjugation in coherence manipulation.

Main Methods:

  • * Theoretical analysis of light propagation in free space.
  • * Investigation of spatial coherence transformations.
  • * Application of phase conjugation principles.

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Main Results:

  • * Demonstrated generation of spatially incoherent light from a coherent source.
  • * Showcased an inverse relationship to the van Cittert-Zernike theorem.
  • * Confirmed that phase conjugation can reverse coherence changes from free-space propagation.

Conclusions:

  • * The inverse van Cittert-Zernike theorem is achievable.
  • * Phase conjugation offers a method to restore light coherence properties.
  • * This research opens new possibilities for controlling light coherence.