Patent ID: 7436875

Claim:
A laser module comprising: one or more semiconductor laser elements which emit one or more laser beams; an optical fiber which has a light-entrance end face; and an optical condensing system which is constituted by one or more optical components and makes said one or more laser beams converge at said light-entrance end face of said optical fiber; wherein said one or more optical components have one or more light-entrance surfaces through which said one or more laser beams are inputted into the one or more optical components and one or more light-output surfaces through which said one or more laser beams are outputted from the one or more optical components, at least one of the one or more light-entrance surfaces and the one or more light-output surfaces is exposed to air, and said one or more laser beams realize an optical power density of 15 W/mm 2 or lower, or 60 to 800 W/mm 2 at said at least one of the one or more light-entrance surfaces and the one or more light-output surfaces.