There are lot, depending on your requirements. Anyway you can try: BBZ)H6TzL 8=b{'s^^F 1, Refractive: an achromatic as positive + plano-convex as negative; gGceK^# OR g@N=N 2, Reflective: two parabolic mirrors; *+zy\AhkP bE%mgaOh Both of them affer nice spherical aberration performance. xw/h~:NT O=9V X Reminder: compute the laser beam density, ensure you have enough strong optical coating. B_6v'=7] ({}O
M=_ Good luck.
Hi, emDvy2uA# 2+G:04eS,e The following is a link of technical data of optical adhesives, hope it be helpful: %<#$:Qb. th>yi)m http://www.lienhe.com.cn/uvadh/NOA60.htm VHY<(4@ ~QQ23k& Double check from your lens vendor waht type of adhesive they use for your cemented doublet. lCs8`bYU "Jv,QTIcS 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. \gk3w,B?E ZJJl944 Again, good luck.