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Question

What is the equivalent non sequential object type for sequential extended toroidal grating surface

  • November 14, 2024
  • 0 replies
  • 33 views

rayTracer

Hello Zemax Community,

I've modeled a freeform lens in sequential mode using the Extended Toroidal Grating Surface Type in Zemax. I defined my lens with parameters for Radius, Conic Constant, and Extended Polynomial Terms. Since the lens is an astigmatic component, it has curvature along the Y-axis while remaining flat along the X-axis, which is why I selected the extended toroidal grating surface.

When I converted the sequential model to a non-sequential model using Zemax’s “Convert to NSC Group” feature, the lens appeared as a combination of Standard Surface, Grid Sag Surface, and Compound Lens. However, the performance doesn’t match my original sequential model, and I suspect the conversion process may not have fully captured the lens design.

My question is:

  • Is there an object type in NSC mode that allows me to manually enter my Radius, Conic Constant, and Extended Polynomial Terms to recreate the lens accurately?
  • Are there recommended steps for converting this type of lens from Sequential to Non-Sequential?

Thank you in advance for your help!

Best regards,
Ben

0 replies

JJiang
  • Infrared
  • 24 replies
  • March 10, 2025

Hi Ben,

Do you need a true freeform or does usual toroidal surface suffice? I don’t have experience in freeform designs but I constantly use toroidal lenses (even-ordered, up to 14th order, also has power in only one direction) in both sequential and non-sequential modes. If in sequential mode the toroidal surface works for you, then in NSC you may choose “Toroidal lens” and edit parameters such as radius, conic and higher order coefficients.

Regards,

Jiang


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