Patent ID: 6116792
Filing Date: 2000-09-12
Classification: H01S

Abstract:
A semiconductor laser module in which one end portion of an optical fiber is fixed to one side wall of a module package of the semiconductor laser module, a temperature adjusting element is fixed onto the bottom surface of the inside of said module package, a base board is fixed onto the upper surface of said temperature adjusting element, and the upper surface of said base board comprises two surfaces having a step therebetween, one surface acting as the upper surface of a lens mount portion on which a lens is fixed by YAG laser welding and the other surface acting as the upper surface of a laser mount portion, and the height of the upper surface of said lens mount portion is set to be lower than the height of the upper surface of said laser mount portion by the length corresponding to about the radius of a lens, characterized in that said lens mount portion of said base board comprises metal plates of an upper layer portion formed of material having a low thermal conductivity and a lower layer portion formed of material having a high thermal conductivity, and the lower layer portion is formed of the same material as said laser mount portion of said base board so as to be integral with said laser mount portion.