Hello, I am trying to optimize a basic four mirror ring cavity in a bowtie configuration. I am looking to optimize the system for the following traits in order of highest to lowest importance:

1. Folding angle of the mirrors to minimize distortions and abberations

2. Minimize the gaussian beam waist at a particular surface (currently set to a detector rectangle)

Additionally if possible, I would like to see how much enhancement we achieve in the cavity upon reaching the cavity's steady state behavior. The system is designed in nonsequential mode. I have set the variables, but I not sure how to correctly use the merit function editor.

How can I optimize for the two traits above, while keeping the variables within my physical constraints?

Ring resonantor image from https://www.rp-photonics.com/ring_resonators.html