| 摘要 |
PURPOSE:To superpose visible light on invisible CO2 laser light and to use the superposed light for indicating the position to be irradiated by forming an optical waveguide for visible light into a tube and passing an IR fiber therein. CONSTITUTION:An IR fiber 3 is passed into a tube 6 consisting of a material which allows transmission of visible light, for example, PMMA (polymethyl methacrylate), etc. The PMMA tube is slit up to the mid-way and the IR fiber is taken out through the slit and is used as an incident end for CO2 laser light. The part 70 of the tube is distributed with the refractive index higher than the refractive index on the inside 71 and outside 72 thereof. The end of the tube on the side slit for the purpose of incidence of visible light is thermally worked to form the construction which is not tubular but circular columnar in section and to which light is made incident effectively. Visible light is thus always focused at one point on the focal plane and is made annular in the parts except the focal plane, by which the presence of IR light in said ring is distinctly indicated. Easy assembly is made possible simply by inserting the IR fiber in the case of manufacturing the IR fiber with indicating light. |
