Laser pumping unit and high power laser device tunnel junction including the same

A semiconductor laser device comprising:

• a laser pumping unit of generating a light with a predetermined wave length;
• and
• an external mirror unit located outside of the laser pumping unit to transmit a portion of the light generated by the laser pumping unit as a laser beam and reflect the other portion of the light toward the laser pumping unit, which absorbs the reflected portion of the light,
• wherein the laser pumping unit comprises:
• a substrate;
• a lower DBR layer formed on the substrate;
• an active layer with a quantum well structure formed on the lower DBR layer to generate a light having a predetermined wavelength;
• a tunnel junction layer formed on the active layer to increase resistance in a vertical direction;
• and
• an upper DBR layer formed on the tunnel junction layer.