| 摘要 |
PURPOSE:To improve the linearity of electro-optical conversion by forming a nonreflective film on the terminal end face of an insulating section. CONSTITUTION:A nonreflective film having film thickness lambda/4 (lambda=luminous wavelength)=2500Angstrom and consisting of calcium fluoride is used as a nonreflective film 9. An insulating section 2 is shaped by polyimide. Accordingly, when the nonreflective film 9 is formed, return beams are reduced, thus acquiring luminous characteristics having the excellent linearity of current-beam conversion. |
