There are lot, depending on your requirements. Anyway you can try: fy&u[Jd{ "zqa:D26 1, Refractive: an achromatic as positive + plano-convex as negative; ''z]o#=^9 OR )N\ BC 2, Reflective: two parabolic mirrors; h2?\A% Ahr Both of them affer nice spherical aberration performance. >5Y. @,W5K$Ka= Reminder: compute the laser beam density, ensure you have enough strong optical coating. "Rtt~["% )vuIO(8F# Good luck.
Hi, .4<lw HJlxpX$_ The following is a link of technical data of optical adhesives, hope it be helpful: _({wJ$aYC Wq}W )E http://www.lienhe.com.cn/uvadh/NOA60.htm Pw6%,?lQ ]A1'+!1$ Double check from your lens vendor waht type of adhesive they use for your cemented doublet. i4M%{]G3Y -uhVw_qq# 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. /2tPd "QBl
"<<s Again, good luck.