| 摘要 |
PURPOSE:To obtain a laser beam which is not mixed with a pumping light from a waveguide core by forming an optical fiber having two or more cores, and doping at least one of the cores with fluorescent substance. CONSTITUTION:An optical fiber 11 for a fiber laser has two cores 12, 13, one 12 of which is of an active core doped with a fluorescent substance 14, such as Nd, Er, Ho, etc., and the other 13 of which is of a normal core (waveguide). When a pumping light l1 from a light emitting element 15 is input to the core 12, a laser oscillation occurs in the core 13 by waveguide coupling, and a laser light l2 not mixed with the light l1 is output from the half mirror 18 of one end. |
