Semiconductor laser module, laser oscillator, and laser machining apparatus

A semiconductor laser module comprising:

• a heat sink;
• a first electrode disposed in a first region of the heat sink;
• an insulating layer disposed on the first electrode;
• a submount disposed in a second region of the heat sink, the second region being different from the first region, the submount being electrically and thermally conductive;
• a laser diode element disposed on the submount, the laser diode element emitting a laser beam;
• a feed structure disposed on the laser diode element, the feed structure being electrically and thermally conductive;
• and
• a second electrode provided on the insulating layer and the feed structure such that the second electrode is in contact with the insulating layer and the feed structure, wherein
• a positional relationship between the heat sink, the first electrode, the insulating layer, and the second electrode is fixed by an adhesive, and the first electrode is bonded to the second electrode with an insulating adhesive.