Semiconductor laser module

A semiconductor laser module comprising:

• a module package;
• a temperature control device comprising electronic cooling elements, the lower plate of which is fixed with the inner bottom surface of said module package;
• a base plate fixed with the upper plate of said electronic cooling device;
• a support plate fixed on the top surface of said base plate;
• a semiconductor laser fixed on the top surface of said support plate for emitting laser light;
• an optical fiber fixed through the side wall of said module package at a position where the laser light is incident;
• and
• a lens for optically connecting said semiconductor laser fixed on said support plate with said optical fiber;
• wherein the module package is provided with a first recess at the inner bottom configured to be fitted to the lower plate of the electronic cooling device, and the lower plate of the electronic cooling device is fitted into the first recess of the module package such that all side surface of the lower plate are in contact with all side surfaces of the first recess;
• and
• said base plate is provided with a second recess at the bottom configured to be fitted with the upper plate of said electronic cooling plate, and the upper plate of said electronic cooling device is fixed with the base plate after fitting the upper plate into the second recess such that all side surfaces of the upper plate are in contact with all side surfaces of the second recess.