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Aperture Divergence

  • September 12, 2022
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Hi everyone,

is it possible to model a divergence aperture?

For example i want to set a entrance pupil diameter divergence of 1,6 mRad.

Thanks a lot in advance

 

Best answer by Ethan

Hi @marco.ievoli,

Sorry about the delayed response. One method to achieve a diverging aperture is by setting the Object Space NA. I’ve put together a simple example below where I set the NA based on 1.6 mRad (assuming the small angle approximation). Then using the equation for NA (from Numerical aperture - Wikipedia) for a given fixed aperture, you can calculate the necessary object distance to make sure that you fill the aperture with rays diverging at 1.6 mRad.

 

 

Best,
Ethan

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Ethan
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  • December 21, 2022

Hi @marco.ievoli,

Sorry about the delayed response. One method to achieve a diverging aperture is by setting the Object Space NA. I’ve put together a simple example below where I set the NA based on 1.6 mRad (assuming the small angle approximation). Then using the equation for NA (from Numerical aperture - Wikipedia) for a given fixed aperture, you can calculate the necessary object distance to make sure that you fill the aperture with rays diverging at 1.6 mRad.

 

 

Best,
Ethan


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