Hello,

I want to focus the beam with two aspheric lenses. I have tried to optimize the system with the merit function, but I still have a large RWS wavefront error that says I can't get a tough focus. Could you please give me some advice on how to further minimize my focus. I can't change the parameters of the lenses (RoC, thickness of the lens, because these lenses already exist), only the distances between the lenses and between lens and mirror. All information about the system and results can be found bellow.

Thank you!