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Ultrashort pulse fiber lasers (FLs) are required to have higher power to achieve high quality laser processing of difficult-to-cut materials such as carbon fiber reinforced plastics (CFRPs). Our present work develops an all-fiber coherent addition system to achieve a high power ultrashort pulse FL beyond pulse-power limits due to nonlinear effects in rare-earth-doped fiber [1]. Coherent addition is...
Fused fiber couplers were fabricated by controlling the coupler waist profile, and the wavelength and the polarization dependences against the waist profile were investigated experimentally. In case of the strongly fused coupler, the coupling is a little stronger for the -polarized light than the -polarized light, and the wavelength dependence increases with fusing more strongly in spite of the shorter...
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