I am trying to model a Shack-Hartmann set-up for measuring off-axis aberrations on a two-lens system. The metrology beam is divergent and the set-up works in double pass with a concave mirror. This is the schematic set-up:
And the lens data editor:
The paraxial lens on surface 2 is what makes the metrology beam divergent. It has an EFL of 30.3 mm.
My goal is to measure the WFE in surface 32 (simulating the position where the microlenses array will be). I am working in “Afocal Image Space” and “Reference OPD > Absolute 2”
A couple of questions about this:
- Where does that high piston como from, and how to get rid of it?
- Is there any way I could get rid of all the on-axis aberrations (focus, spherical), maybe on a dummy surface, so I can have a look at the remaining RMS when I tilt the lenses?
Thanks in advance for your help.
