Method for assembling array-type semiconductor laser device

A method for assembling a semiconductor laser device, said method comprising:

• preparing a semiconductor laser chip that includes:
• a semiconductor substrate comprising a gain producing area and a window area;
• a plurality of stripe waveguides that are formed on the semiconductor substrate in parallel at a first interval and that each includes a part of the gain producing area and a part of window area;
• a plurality of first electrodes that are formed on the plurality of stripe waveguides, respectively;
• an insulating layer that is formed on the plurality of first electrodes;
• a metal layer that is formed on the insulating layer;
• a plurality of joining structures that are formed on first positions above the window area so as to be connected to the plurality of first electrodes, respectively;
• and
• a plurality of alignment projections that are formed on second positions above the window area and that are arranged at a second interval, the first positions and the second positions being different from one another;
• preparing a submount that includes:
• a first solder layer;
• a plurality of second solder layers that are arranged at the second interval;
• and
• a plurality of submount electrodes that are connected to the plurality of second solder layers, respectively;
• aligning the laser chip with the submount by fitting the plurality of alignment projections into spaces between the plurality of second solder layers;
• bringing the semiconductor laser chip into contact with the submount so that the metal layer contacts the first solder layer and so that the plurality of joining structures contact the plurality of second solder layers;
• and
• heating the submount and the semiconductor laser chip to fuse the first solder layer and the plurality of second solder layers.