抄録
We have developed optical fibers with an antireflection coating on the output end of the fiber for a copper vapor laser and have carried out experimental estimation of the characteristics. The used coating material are HfO2 and SiO2. The core diameter of the fiber is 0.6mm and 1.0mm. The reflectance of the coating at 511nm is 0.2-0.6%. The damage threshold was determined at a laser power density of above 35 kWatt/cm2 (7.3J/cm2 at 4.8kHz). We could use the coated fibers to transmit a copper vapor laser-beam for dye laser pumping. In that case the maximum laser power in one fiber was up to 100 Watt. During 100 hours operation there was no damage and little decreasing transmittance of the coated fibers.
