| 摘要 |
PURPOSE:To transmit the greater part of a reflected light without coupling it in a hollow optical waveguide, and also, without nearly deteriorating the transmission efficiency from the incident direction by setting thickness of a dielectric to thickness for giving the minimum loss on the incident side, and also, setting it to thickness shifted from the thickness for giving the minimum loss on the emitting side. CONSTITUTION:Thickness of a dielectric of a dielectric incorporated metallic hollow waveguide is set so that it becomes the minimum loss only on the incident end side, and set to thickness shifted from the film thickness for giving the minimum loss on the emitting end side. For instance, a Ge incorporated Ag/Ni hollow optical waveguide 1 for a CO2 laser light of 10.6mu wavelength is manufactured by incorporating an Ag film 5 of uniform thickness on the inside of an Ni layer 6, and also, incorporating interiorly Ge films 3, 4 of different thickness on its inside. In such a way, the coupling loss is small against an incident light, and the coupling loss becomes large against a reflected light. |
