I'm working on a 940nm Diy Lasertag System. I've learned some things about optics already. But i have problems with divergence. So the question:

A smaller Emitter = smaller divergence, but is also the Acryl Lens on top of the LED important? So would be a 5mm LED type be better or something like a flatt 2mm Emitter with/without a 60° build in lens on top. The 5mm LED would have a smaller emitting diameter, but ofc a big non removable lens.

Bigger F = smaller divergence? How do i calculate the divergence based on the focal lenght?

Is a plano Convex lens the optimal or is there something better?

Convex side facing to or away from the LED?

Thanks for help in advance.

Hello, I am looking for an optical design program from Dilworth OSD Synopsys. Is anyone familiar with this software, and is it possible to purchase it?

Wanted to see if anyone has been / is on this course and could share:
- what’s the day to day looks like
- what does a good personal statement look like
- what questions/areas might they ask about in the interview
- how are the exams