However, I’m struggling to get the correct geometry. This is the layout (with apertures)
Zemax attempt (w/ apertures)
and without the apertures:
I would like the rays to reach the second parabola and be reflected towards the image.
Any obvious mistake with the geometry?
Best answer by MichaelH
@ajs_c You’re actually making it way harder than it needs to be. Since the direction of propagation doesn’t change with each reflection, you don’t need any tilts for your Coordinate Break since the AOI deflects the beam. You actually only need 2 Coordinate Breaks:
Decenter Mirror 1 (70mm) so the beam hits the off-axis portion of the beam
Decenter the plane after Mirror 2 (70mm) so the rest of the optical system has a new reference
Applying the appropriate apertures, I get the following Lens Data Editor for your system:
After applying a Circular Aperture to the MIRROS surfaces and using the correct Maximum Radio and Aperture Y-Decenter, you’ll get your expected result.
@ajs_c You’re actually making it way harder than it needs to be. Since the direction of propagation doesn’t change with each reflection, you don’t need any tilts for your Coordinate Break since the AOI deflects the beam. You actually only need 2 Coordinate Breaks:
Decenter Mirror 1 (70mm) so the beam hits the off-axis portion of the beam
Decenter the plane after Mirror 2 (70mm) so the rest of the optical system has a new reference
Applying the appropriate apertures, I get the following Lens Data Editor for your system:
After applying a Circular Aperture to the MIRROS surfaces and using the correct Maximum Radio and Aperture Y-Decenter, you’ll get your expected result.
I also have been struggling a bit with the OAP, and this indeed is a very compact set-up. I did notice in setting up a pair of OAP with some coordinate breaks for retro reflection, that I could get a perfect spot diagram (with a paraxial lens), but I noticed that the final semi-diameter was not idential to the stop semi-diameter. So I'm a bit puzzled how a perfect spot still could give different semi diameters. I think it has to do with ray tracing to parallel surfaces?
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