![]() You can also try the merit function operator RANG which optimize for the the ray angle with the Z-axis. 80 3.5 Merit Function When using Zemax to design and optimize an optical system. There are also available standard ghost control merit function operands in the sequential ray-trace, for example in Zemax system, but these dont allow back. I have my own custom merit function that is before the suggested combo of default merit functions, which I would guess shouldn’t cause a problem, but maybe I’m wrong? Any other suggestions for someone wanting to keep a beam collimated at one surface while also optimizing the beam’s focus at the final image plane? Maybe I’m not using the wizard for the angular criterion correctly? I followed your general guideline, including those terms after my custom merit function, and using the defaults for the two image criterions in the optimization wizard, except for the start at. Besides many standard functions, Zemax also provides a tool called Zemax. I tried that method and it didn’t keep the beam collimated at the intermediate, temporary image plane. ![]() IMSF i #set surface i to be the image surface #add operands here using the Start At dropdown in the Optimization wizard IMSF j #set surface j to be the image surface #add operands here using the Start At dropdown in the Optimization wizard To set collimation at surface i, and spot (say) at surface j, use the IMSF (Image Surface) operand in the merit function to redefine the image surface on the fly. ![]() ![]() Yes that's right Steve: the Angular criterion reduces RMS angle the same way that the spot criterion reduces RMS spot
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