There are lot, depending on your requirements. Anyway you can try: e8]mdU{) N)z]
F9Kg 1, Refractive: an achromatic as positive + plano-convex as negative; J_|>rfW OR 8>:2li 2, Reflective: two parabolic mirrors; H
@E-=Ly / dn]`Ge) Both of them affer nice spherical aberration performance. DNM~/Oo P#Ikj&l Reminder: compute the laser beam density, ensure you have enough strong optical coating. s{j3F pm;g)p? Good luck.
Hi, !p9F'7;Y< Ri-wbYFaP The following is a link of technical data of optical adhesives, hope it be helpful: IX3U\_I# i|d41u;@ http://www.lienhe.com.cn/uvadh/NOA60.htm "|&*MjwN6 Pr/&p0@aV Double check from your lens vendor waht type of adhesive they use for your cemented doublet. hQ8{
A7 q{JD]A : It is OK to use the spaced doublet design as a backup, if so, please pay a lot attention on the opto-mechanical design and assembling. 3i$AR <?nr"V Again, good luck.