There are lot, depending on your requirements. Anyway you can try: 0d.lF: B*K%&w10~ 1, Refractive: an achromatic as positive + plano-convex as negative; [Fjh OR Y`\zLX"_m 2, Reflective: two parabolic mirrors; aU 5t|S6 pcm| Both of them affer nice spherical aberration performance. CuU"s) hF!yp7l; Reminder: compute the laser beam density, ensure you have enough strong optical coating. dzggl( d$b{KyUA Good luck.
Hi, I-&/]<5y A]Q4fD1q The following is a link of technical data of optical adhesives, hope it be helpful: TDy@Y>
) l<GRM1^kU http://www.lienhe.com.cn/uvadh/NOA60.htm -&@[]/ E8#y9q Double check from your lens vendor waht type of adhesive they use for your cemented doublet. |LiFX5!\ 3l<)|!f]g 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. &A=d7ASN= _17c}o#`5w Again, good luck.