Hello Everyone,
I’m trying to get a spot diagram and psf of a system with tilted window. The system is a simple 1:1 imaging with two f=50mm paraxial lenses.
However, when the window is tilted in 45 degrees (I did the tilting using the “Tilt/Decenter Elements” tool in LDE), the spot diagram and psf looks weird. Below shows an elliptical beam when slightly away from focus.
I wonder what’s the reason that causes the beam deformation?
Thanks,
Sean
Best answer by Jeff.Wilde
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+3
The tilted plate introduces aberrations, predominantly astigmatism (which varies as the square of the tilt angle). See, for example, Modern Optical Engineering (3rd ed.) by W. Smith, Sec. 4.8:
Regards,
Jeff
Thank you, Jeff, for the explanation.
Sean
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