22 August 2005 Development of laser scissors for carbon and silicon carbide fiber cutting
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Laser cutting of carbon (C) and silicon carbide (SiC) fibers was performed using a second harmonic generation (SHG) sheet beam of Q-switched Nd:YAG laser with an out put energy of 4J/pulse, pulse width of 10ns and a fluence of 3.0J/cm2. The beam was irradiated respectively on monofibers of C and SiC placed on an optical glass slide in air at room temperature. A single pulse was irradiated every one second and repetition number of shot pulses N was varied from N=10 to 40 pulses. Cutting of C and SiC fibers occurred for N = 20-40 pulses. A cut portion of C fiber fixed on the substrate for one end in tension free was found to have very sharp wedge like profile. Laser irradiation for C fiber fixed with both ends on the substrate made the fiber fractured with thinner fiber diameter. Similar profile was also observed in a SiC fiber at the cut portion. Smooth flat surface of laser cut portion of C and SiC fibers suggested a laser ablation by evaporation. In the SiC fiber, sticky and viscous layer was observed at the cut surface, suggesting vitreous silica formed by oxidation of laser-irradiated fiber.
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Hiroshi Murotani, Hiroshi Murotani, Hironobu Sakata, Hironobu Sakata, Akira Yoshikado, Akira Yoshikado, Moriaki Wakaki, Moriaki Wakaki, } "Development of laser scissors for carbon and silicon carbide fiber cutting", Proc. SPIE 5869, Optical Manufacturing and Testing VI, 58691G (22 August 2005); doi: 10.1117/12.618118; https://doi.org/10.1117/12.618118

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