There are lot, depending on your requirements. Anyway you can try: A3<P li
Hzk1LKsT#
1, Refractive: an achromatic as positive + plano-convex as negative; RBHqLg(
OR ;$k?&nhY
2, Reflective: two parabolic mirrors; (STWAwK-
z[<pi:
Both of them affer nice spherical aberration performance. iq[2H$
reD[j,i&t.
Reminder: compute the laser beam density, ensure you have enough strong optical coating. D8<0zxc=(
SWe!9Y$
Good luck.