Laser array device

A laser array device used in a laser irradiation system which comprises a plurality of laser beam output sections provided to output a plurality of laser beams to the laser array device, wherein the laser array device is configured to emit a plurality of output laser beams based on the plurality of laser beams so as to focus the plurality of output laser beams at a target point, the laser array device comprising:

• a plurality of lens tubes comprising a first lens tube through which a first laser beam passes and a second lens tube through which a second laser beam passes, the first laser beam and the second laser beam are ones of the plurality of laser beams corresponding to the first lens tube and the second lens tube, respectively;
• a support mechanism disposed to support the plurality of lens tubes such that the plurality of lens tubes are parallel to each other;
• a plurality of first lenses arranged in the first lens tube;
• a plurality of second lenses arranged in the second lens tube;
• a first temperature-rise suppressing mechanism disposed inside a peripheral wall of the first lens tube to suppress temperature rise of the first lens tube;
• and
• a second temperature rise suppressing mechanism disposed inside a peripheral wall of the second lens tube to suppress temperature rise of the second lens tube,
• wherein the plurality of first lenses comprises an incident-side lens arranged on a laser beam incident-side and an emitting-side lens arranged on a laser beam emitting side,
• wherein the plurality of second lenses comprises an incident-side lens arranged on a laser beam incident-side and an emitting-side lens arranged on a laser beam emitting side, and
• the first temperature rise suppressing mechanism comprises a temperature rise suppressing mechanism of a different type from the second temperature rise suppressing mechanism.