Evolution of conically diffracted Gaussian beams in free space

Stephen D. Grant, Amin Abdolvand

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We present results of our observations on the free space evolution of conically diffracted beams from both single and cascade systems using various combinations of four biaxial crystals of the monoclinic double tungstate family [KGd(WO4)2]. Longitudinal shifts and radii of the Hamilton-Lloyd pair of rings were measured. In each case, the symmetric-forward and backward-evolution of the beam in free space from its focal image plane was monitored and quantified. Theoretical ring plane patterns based on a recently presented theoretical model are also compared to experimental patterns and found to be in good agreement.

Original languageEnglish
Pages (from-to)3880-3886
Number of pages7
JournalOptics Express
Issue number4
Publication statusPublished - 24 Feb 2014
Externally publishedYes


  • conical diffraction
  • light beams
  • biaxial crystals

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