FLUORINATED OPTICAL MATERIAL COMPRISING FLUOROPOLYMER HAVING FUNCTIONAL GROUP CAPABLE OF FORMING COMPLEX WITH RARE EARTH METAL ION

摘要

There is provided an optical material which is an organic composition comprising a rare earth metal ion and a fluorine-containing polymer having functional group being capable of forming a complex with the rare earth metal ion and is suitable as an optical material for optical communication, in which the fluorine-containing polymer having functional group being capable of forming a complex with the rare earth metal ion has a side chain having at least two hetero-atoms in its structural unit and has a maximum absorption coefficient of not more than 1 cm-1 in each bandwidth of from 1,290 to 1,320 nm, from 1,530 to 1,570 nm and from 600 to 900 nm, and the rare earth metal ion is at least one selected from the group consisting of erbium (Er) ion, thulium (Tm) ion, praseodymium (Pr) ion, holmium (Ho) ion, neodymium (Nd) ion, europium (Eu) ion, dysprosium (Dy) ion, samarium (Sm) ion, cerium (Ce) ion and terbium (Tb) ion.