There are lot, depending on your requirements. Anyway you can try: g1(`a`M @f%q ,: 1, Refractive: an achromatic as positive + plano-convex as negative; hx:"'m5 OR hWAZP=H 2, Reflective: two parabolic mirrors; Y N*"q'Yz_ xa? Both of them affer nice spherical aberration performance. +ieRpVg pa2cM%48 Reminder: compute the laser beam density, ensure you have enough strong optical coating. p^X
\~Yibs |P`: NAf2 Good luck.
Hi, \%$z!]S> zqs|~W]c The following is a link of technical data of optical adhesives, hope it be helpful: Hribk[99 ht5eb"c+8 http://www.lienhe.com.cn/uvadh/NOA60.htm kzXmiBL<9 ;nZN}&m
Double check from your lens vendor waht type of adhesive they use for your cemented doublet. L6f$ID: mrId`<L5l{ 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. sEm064 ?h7(,39^> Again, good luck.