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Shaping the focal intensity distribution using spatial coherence.

Thomas van Dijk1, Greg Gbur, Taco D Visser

  • 1Department of Physics and Astronomy, Free University, De Boelelaan 1081 HV, Amsterdam, The Netherlands.

Journal of the Optical Society of America. A, Optics, Image Science, and Vision
|March 4, 2008
PubMed
Summary
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Altering coherence length in partially coherent light fields can modify focal intensity distributions, creating local minima. This research explores wave field coherence and its impact on optical applications.

Area of Science:

  • Optics and Photonics
  • Wave Phenomena

Background:

  • Partially coherent light fields exhibit complex behavior upon convergence.
  • Understanding focal region characteristics is crucial for advanced optical applications.

Purpose of the Study:

  • To investigate the intensity and coherence state within the focal region of converging, partially coherent wave fields.
  • To analyze Bessel-correlated fields and the influence of coherence length on focal properties.

Main Methods:

  • Theoretical analysis of converging wave fields.
  • Detailed study of Bessel-correlated fields.
  • Examination of intensity distribution and coherence states at the focus.

Main Results:

  • Modifying coherence length alters the intensity distribution at the focus.

Related Experiment Videos

  • Local intensity minima can be generated at the geometrical focus.
  • Pairs of fully correlated and completely incoherent points exist in the focal region, even for partially coherent incident fields.

    • Conclusions:

    • Coherence properties significantly influence the focal characteristics of partially coherent light.
    • The findings have implications for optical trapping and beam shaping technologies.