Patent ID: 9172202
Filing Date: 2015-10-27
Classification: B23K,H01S

Abstract:
1. A laser apparatus comprising: an active fiber having a core, a first end and second end; a passive fiber connected to the second end of the active fiber, the passive fiber having a core and an inner cladding surrounding the core; a first laser light source that emits a first laser beam into the core of the active fiber; and a second laser light source that emits a second laser beam that is coupled into the inner cladding of the passive fiber, wherein the second laser light source is located at a downstream side of the first laser light source, wherein a refractive index of the core of the passive fiber is larger than a refractive index of the inner cladding of the passive fiber, and wherein a power density distribution of each of the first laser beam and the second laser beam which are emitted from an output end of the passive fiber is a multi-mode.