Patent ID: 7885299

Claim:
A semiconductor laser apparatus, comprising: a semiconductor laser array; a heat sink having a refrigerant flow path which includes plural branches, said heat sink having a supply port serving as one end of said refrigerant flow path and a discharge port serving as the other end of said refrigerant flow path; a liquid refrigerant including fluorocarbon and flowing through said refrigerant flow path; a piping, through which the liquid refrigerant circulates, having one end connected to said supply port and the other end connected to said discharge port; and a refrigerant supplier for supplying the liquid refrigerant to said heat sink, said refrigerant supplier having a circulation pump which is provided at a predetermined portion of said piping and controls a flow velocity of the liquid refrigerant at 10 m/s or less for every branch of said refrigerant flow path so as to inhibit the occurrence of cavitations in the liquid refrigerant.