Non-Sequential Paraxial Lens scrambles coherent phase

  • 22 September 2022
  • 2 replies

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Simple model:

  • Pt source
  • Paraxial lens
  • Detector

Collimating a point source produces a nice output when reviewing incoherent results.  However, the coherent results are not intuitive.  Can somebody provide and explanation?

Incoherent Irradiance


Radiance (angular)

Coherent Irradiance

Coherent Phase



Best answer by Brian.Catanzaro 22 September 2022, 18:48

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2 replies

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Mark provides the answer… OPD is not computed for paraxial lenses.

Userlevel 6
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Indeed so. But there is a simple workaround...the Sweatt lens. Make a model material of really high index, say 1000, and give it radii to achieve whatever focal length you want. The OPD can be calculated for this real lens (with a fictitious glass).