There are lot, depending on your requirements. Anyway you can try: AAlmG9l&7 "NXm\`8 1, Refractive: an achromatic as positive + plano-convex as negative; :FKYYH\ OR Skr\a\
J 2, Reflective: two parabolic mirrors; e4>L@7 bJG!)3cx Both of them affer nice spherical aberration performance. B
$ y44 ,oB k> Reminder: compute the laser beam density, ensure you have enough strong optical coating. *_"c!eW @'F8 |I 6 Good luck.
Hi, JQbMw>Y E^EU+})Ujr The following is a link of technical data of optical adhesives, hope it be helpful: K#6`LL m die2<'\4% http://www.lienhe.com.cn/uvadh/NOA60.htm &\6`[# bT :UJUh/U Double check from your lens vendor waht type of adhesive they use for your cemented doublet. nX.s h # 1qVFU 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. ^b `>/> S'%cf7Z Again, good luck.