Aspherical surface in Lumerical FDTD

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    • Yuan0710

      Dear all,

      Recently, I want to create an aspherical lens in Lumerical, and the formula follows extended asphere (page 298)

      However, the schematic of the surface is quite different from the Zemax.

      I also used python to check the surface, and here is my code:


      The correct aspherical surface should be :

    • Greg Baethge
      Ansys Employee

      Thanks for posting on the forum. Could you check the x span and y span defined in the "Geometry" tab? They should be large enough to cover the full width of the lens. I ran a quick test, it seemed to work:

      I only copied and pasted the custom term from your post.

    • Yuan0710

      This is my current geometry setting but the schematic is wrong.

      However, it is strange about the results of the aspherical surface.
      Recently, I successfully used "import surface" to establish my aspherical lens, though.

    • Greg Baethge
      Ansys Employee

      I have to admit I've never really used this surface object. I'm more familiar with the surface import, that would have been an alternative I would have suggested.
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