| 摘要 |
PROBLEM TO BE SOLVED: To provide a varnish of a fluorinated polyimide precursor, to which rare earth metal ions are added with high concentration, and to provide an optical waveguide amplifier using the same. SOLUTION: A material for optical doping is obtained by mixing salt of rare earth metal and a carboxylic acid compound or phenol compound in an organic solvent, and the varnish contains the fluorinated polyimide precursor. COPYRIGHT: (C)2009,JPO&INPIT |
