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There has been a problem that pump light leaks from a portion having a coating at the joint of a double clad fiber added with a rare earth element and a general single mode fiber, and heat is generated partially from the fiber by that energy thus causing deterioration of the fiber. Deterioration of a fiber due to residual exciting light can be prevented by preventing residual exciting light in a double clad fiber from exiting to a single mode fiber, and the reliability is enhanced. Output of oscillation light can be increased because output of exciting light is not limited. Furthermore, a laser display having high color reproducibility can be achieved by employing a light source combining a fiber laser light source and a wavelength conversion module.