| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an optical filter which is easy to produce and by which the wavelength of monochromatic light which can be taken out can be changed. <P>SOLUTION: The optical filter 1 is provided with: a refractive index distribution type optical transmission part 4 where a refractive index is continuously reduced from a center toward an outer peripheral part and the distribution constant of the refractive ratio is varied corresponding to a temperature; a connection part 6 for wavelength multiple light provided on one end side of the axial direction of the optical transmission part; a connection part for monochromatic light 10 provided on the other end side of the axial direction of the optical transmission part; and a temperature changing means 12 which changes the temperature of the optical transmission part, changes the emitting positions of the monochromatic light included in the wavelength multiple light incident on the optical transmission part from the connection part for wavelength multiple light from the optical transmission part and selectively makes one of monochromatic lights incident on the connection part for the monochromatic light. <P>COPYRIGHT: (C)2003,JPO</p> |
