Patent ID: 7304293

Claim:
A laser module, comprising: i) a laser unit containing a laser package, which is provided with a laser beam transmissive window for radiation of a laser beam and in which at least one laser element has been hermetically sealed, ii) a converging optical system unit, which contains a converging optical system for converging the laser beam having been radiated out from the laser package, and iii) an optical fiber for receiving the laser beam having been converged by the converging optical system, the laser unit and the converging optical system unit having been connected to each other, wherein the laser unit is provided with a laser package holder, which comprises (a) a holder main body for supporting and accommodating the laser package, and (b) a connecting member for connection to the converging optical system unit, the connecting member having been secured to the holder main body of the laser package holder, the converging optical system unit is provided with a converging optical system holder, which comprises (a) a holder main body for supporting and accommodating the converging optical system, and (b) a connecting member for connection to the laser unit, the connecting member having been secured to the holder main body of the converging optical system holder, the connecting member of the laser package holder and the connecting member of the converging optical system holder have been welded to each other, and a thermal conductivity of the holder main body of the laser package holder is set at a value, which is larger than the thermal conductivity of the connecting member of the laser package holder and the thermal conductivity of the connecting member of the converging optical system holder.