There are lot, depending on your requirements. Anyway you can try: 1EWZA UP%6s:>: 1, Refractive: an achromatic as positive + plano-convex as negative; mm.%Dcn OR ~-B+7 2, Reflective: two parabolic mirrors; Ndgx@LTQQ =2ED
w_5E Both of them affer nice spherical aberration performance. ,|.}6\zl*{ bX`Gv+ Reminder: compute the laser beam density, ensure you have enough strong optical coating. )S/=5Uc -|>T?
t'K Good luck.
Hi, ={V@Y-5T b78~{ht` The following is a link of technical data of optical adhesives, hope it be helpful: SY%y *6[6 ' VKD$q http://www.lienhe.com.cn/uvadh/NOA60.htm DuZ Zu GQ>0E Double check from your lens vendor waht type of adhesive they use for your cemented doublet. wJCw6&D,/ (V]3w 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. .R'M'a#*!A '%XYJr:H[ Again, good luck.