There are lot, depending on your requirements. Anyway you can try: nV'B!q hPl;2r 1, Refractive: an achromatic as positive + plano-convex as negative; Z|)~2[Roa OR i"r=b%;; 2, Reflective: two parabolic mirrors; SU*P@?:/} W1#3+ Both of them affer nice spherical aberration performance. 4VK5TWg Q)v8hNyUmA Reminder: compute the laser beam density, ensure you have enough strong optical coating. 0FXM4YcrJO UZV)A} Good luck.
Hi, sH6srwI 9~a_^m/ The following is a link of technical data of optical adhesives, hope it be helpful: JG4Tb{F= |s|RJA1 http://www.lienhe.com.cn/uvadh/NOA60.htm tr):n@ |]Ockg[ Double check from your lens vendor waht type of adhesive they use for your cemented doublet. aX0sy\Z]j _oR6^#5# 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. _w)0r}{ zS.7O'I<' Again, good luck.