Nonsquanial GRIN lens modeling

Question

Hi,

I am trying to develop a GRIN lens model for my optical design. However, the profile of the beam output is not correct. I would like to learn how I can fix it.

Below is a screenshot of the result I have from Zemax 13. As we can see, the beam only focuses on one axis (y-axis). The width in the z-axis reminds the same. I tried to run the simulation using OpticStudio 22.3, but the result reminds the same.

I followed this thread to start my work.

The GRIN lens I use is from Edmund #64-541.

(https://www.edmundoptics.com/p/10mm-dia-810nm-dwl-00mm-wd-nir-coated-grin-lens/19253/)

I imported the .step file downloaded from the website and assigned the index based on what I got from the sequential mode.

I feel this issue comes from the .step file. I tried to draw a solid cylinder with 1 mm in diameter and 2.38 mm in length (the same as the dimension of the GRIN lens), but it did not work… Maybe I should not draw a solid cylinder directly. Or it was actually caused by other issues.

The .ZAR file is attached for your reference. I appreciate your help in advance.

Thanks,

Tse-Shao

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Dear Tse-Shao,

Thanks for sharing the design file - always easier to investigate.

Indeed, the .step file focuses only along 1 axis. Yet, the cylinder volume works OK on my end :

My feeling is that there is an axis mismatch when using the .Step file. When you import the geometry, it is tilted 90° and the GRIN material seems to keep this initial orientation for some reason.
I can’t figure out, though, why I wouldn’t work with a cylinder volume on your end ?
Please find the .zmx file herewith attached.

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Christophe.Weisse · Accepted Answer

Dear Tse-Shao,Thanks for sharing the design file - always easier to investigate.Indeed, the .step file focuses only along 1 axis. Yet, the cylinder volume works OK on my end :GRIN 5 lens with cylinder volumeMy feeling is that there is an axis mismatch when using the .Step file. When you import the geometry, it is tilted 90° and the GRIN material seems to keep this initial orientation for some reason.I can’t figure out, though,why I wouldn’t work with a cylinder volume on your end ?Please find the .zmx file herewith attached.

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