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conic constant

- August 27, 2024 at 12:27 pm
  
  arezoo.tahmasebi
  Subscriber
  
  I am trying to designe a biconic lens using Zemax. Does anybody know how I can calculate the conic in x and y direction constant of a biconic surface when I just have the radii of curvature in x and y direction? I would be garteful if anybody can help me out with that. I have just started learning zemax.
- August 27, 2024 at 11:36 pm
  
  Ethan Keeler
  Ansys Employee
  
  Hi Arezoo,
  Are you trying to model an ellipsoid by specifying the conic terms? If that's the case, then you can find a detailed explanation of that calculation here: Biconic (ansys.com). For convenience, I've copied the equations and listed them below:
  - August 28, 2024 at 8:43 am
    
    arezoo.tahmasebi
    Subscriber
    
    Thank you! Quite helpful!
    Yes, I think that’s the case. At first, I thought it could be considered part of a sphere because the radii of curvature are only slightly different. Now, I’ll do the precise calculation.

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