Solved

Adding sag error to asphere surface

  • 16 March 2021
  • 1 reply
  • 201 views
Jonathan.Bumstead

Hello,


I have received a sag error measurement from a manufacturer for an asphere. I'd like to model the system performance with this sag error in Zemax by adding the sag error to the nominal asphere surface sag. What is the best way to take the curve in the left of the image and create a surface in Zemax that models this profile? In other words, I'd like to add the sag of these two curves shown below and create a surface in Zemax. It is okay to assume the error is rotational symmetric.



Thanks,


Jon

icon

Best answer by David.Nguyen 16 March 2021, 17:11

View original

1 reply

David.Nguyen
Rank
Userlevel 7
Badge +2

Hi Jonathan,


I'm not sure you can add that error on the profile directly.


What I would do is use a Grid Sag Surface in OpticStudio, and use Python to make that error into a 2D grid formatted for the Grid Sag.


If your asphere is an Even Asphere, which I assum it is because its rotationally symmetric. You can copy the aspheric terms into the aspheric terms of the Grid Sag, that'll give you the base asphere, and the values of the grid sag will contain the error.


Does that make sense? Let me know if you need more details to implement that solution.


Take care,


David

Reply


Community Posting GuidelinesCookie settings


Zemax Community

Need more help?

To Chinese users:

Do not provide any information or data that is restricted by applicable law, including by the People’s Republic of China’s Cybersecurity and Data Security Laws ( e.g., Important Data, National Core Data, etc.).


不要提供任何受适用法律，包括中华人民共和国的网络安全和数据安全法限制的信息或数据（如重要数据、国家核心数据等）。



Privacy policy   License Agreements    Terms of use    Cookie Policy   Zemax Account Licensing Policies