| 摘要 |
PURPOSE:To obtain radiation light having a uniform intensity in regions where the refractive index of clad parts changes by periodically forming the regions of the refractive index approximate to the refractive index of core parts along the light propagation direction of optical waveguides in the clad parts on the surface of an optical waveguide array. CONSTITUTION:The clad part 6 is periodically formed with the regions of the refractive index approximate to the refractive index of the core parts 1a along the light propagation direction of the optical waveguides. The light 12 emitted from a light source 11 enters the respective optical waveguides from the end face of the optical waveguide array 9 and propagates in the respective optical waveguides. The light propagating in the respective optical waveguides leaks without totally reflecting in the regions of the refractive index approximate to the refractive index of the core parts 1a formed in the clad part. The light is radiated in the direction nearly perpendicular to the optical waveguide from the respective regions of the clad part on the surface of the optical waveguide array 9 in this way. The light is thus projected uniformly to an object 10 to be irradiated facing the optical waveguide array 9. |
