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Antonin,

I've put a zemax file with matching OAP macro onto docushare, in Palomar AO, in a new folder called "Raytrace Files". This has telescope, AO relay, and SSMs, up to the focus that sits inside the MGSU. It does not have the height change between SSM1 and SSM2.

You only need the macro if you change OAP parameters (decenter, focal length). It computes the sag, off-axis angle, and slant focal length from analytic formulas and pokes them into the lens sheet. These five quantities are tied together geometrically, and any two determine the other three. If you don't compute them from formulas, but just enter some overdetermined set of measured values, the resulting inconsistencies mess up the zemax coordinate system, and weird stuff starts to happen downstream. As a check of the macro, notice that the central field point arrives at image coordinates 0.000, 0.000, and focus is geometrically perfect, with no tweaks.

Because the main telescope is used at an off-optimum focus, I modeled the DM as an "Irregular" surface, and let it correct spherical aberration only. This makes the telescope/AO geometrically perfect, on axis, while keeping the accepted value of conic constant for the secondary. There are a couple of dummy surfaces at the very end to show the real (not paraxial) exit pupil, which was requested by the SWIFT folks. A line in the merit function sets this up. With a non-rotational system, the "paraxial exit pupil position" and the "chief height solve" are both broken, and you need to use an out-of-plane real ray to get a good position for a pupil conjugate.

I'll be generating a .doc file to write up all of this and will put it in the same folder. The .zmx file by itself should get you started. Cheers, Chris

-- AntoninBouchez - 03 May 2006

Topic revision: r1 - 2006-05-03 - AntoninBouchez
 
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