There are lot, depending on your requirements. Anyway you can try: PxE3K-S)G
hpJ-r
1, Refractive: an achromatic as positive + plano-convex as negative; ~v"L!=~G;a
OR M#[{>6>iE
2, Reflective: two parabolic mirrors; w`=\5Oa .G
yiI1x*^
Both of them affer nice spherical aberration performance. 4Z,!zFS$`
VD\=`r)nT
Reminder: compute the laser beam density, ensure you have enough strong optical coating. r"R#@V\'1b
V470C@
Good luck.