Abstract
Chemical Oxygen Iodine Laser (COIL) of 1.315μm wavelength is confirmed to be transmitted through silica optical fiber with low absorption loss as same as YAG laser. The authors are planning to use COIL for repair of fusion reactor, and made cutting test and welding test of stainless steel with optical fiber and mirror beam delivery system.The use of 0.3mm core diameter silica optical fiber of 200m length was succeeded to transmit the lkW power beam of COIL with low transmission loss of about 4.6dB/km in the 200m distance.5kW CW COIL of supersonic flow type have next developed, and succeeded in cutting stainless steel of type 316L of 35 mm thickness with N2 gas as the assistant gas. Multi-layer welded samples of stainless steel up to 40mm thick were also made with the supersonic flow type COIL.A simplified formula to express the laser performance such as cutting and welding was derived which is available to estimate performance of various lasers including COIL, YAG, and CO2 lasers.Chemical Oxygen Iodine Laser (COIL) of 1.315μm wavelength is confirmed to be transmitted through silica optical fiber with low absorption loss as same as YAG laser. The authors are planning to use COIL for repair of fusion reactor, and made cutting test and welding test of stainless steel with optical fiber and mirror beam delivery system.The use of 0.3mm core diameter silica optical fiber of 200m length was succeeded to transmit the lkW power beam of COIL with low transmission loss of about 4.6dB/km in the 200m distance.5kW CW COIL of supersonic flow type have next developed, and succeeded in cutting stainless steel of type 316L of 35 mm thickness with N2 gas as the assistant gas. Multi-layer welded samples of stainless steel up to 40mm thick were also made with the supersonic flow type COIL.A simplified formula to express the laser performance such as cutting and welding was derived which is available to estimate performance of various lasers including COIL, YAG, and CO2 lasers.
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