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I am trying to create a pair of 90-degree off-axis parabolic mirrors, oriented with the focus between them:

Sketch

 

As others have suggested, and taking inspiration from this post—Off Axis Parabolic mirror collimation | Zemax Community—I create entire parabolas and then aperture down to only the off-axis sections.

 

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?

@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:

  1. Decenter Mirror 1 (70mm) so the beam hits the off-axis portion of the beam
  2. 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.

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