Light‐focusing plastic rod with low chromatic aberration

Chromatic aberration of the light‐focusing plastic rod (LFR) prepared by the two‐step copolymerization technique of a M₁‐M₂ monomer pair is discussed theoretically. It is found that the chromatic aberration depends on the respective optical properties of the M₁ polymer and M₂ polymer alone, and that the selection of a M₁‐M₂ monomer pair is the most important determinant for low chromatic aberration. The requisites for low chromatic aberration are shown. Furthermore, we prepared a LFR with low chromatic aberration by using diethylene glycol bis (allyl carbonate) as M₁ and 1,1,3‐trihydroperfluoropropyl methacrylate or 1,1,5‐trihydroperfluoropentyl methacrylate as M₂; the chromatic aberration parameter is in good agreement with the theoretical value.