Laser apparatus in which laser oscillation part, air cooling machine and dehumidifier are cooled by common cooling water

A laser apparatus comprising:

• a laser oscillation part including a heat receiving part to which heat generated by a laser light source is transmitted;
• a housing in which the laser oscillation part is arranged;
• an air cooling machine having a heat absorption part which absorbs heat of internal air of the housing;
• a dehumidifier having a low temperature part and a high temperature part whose temperature is higher than the low temperature part;
• and
• a cooling water supply device including a cooling water pipe through which a cooling water is supplied to the heat receiving part, the heat absorption part and the high temperature part, wherein
• the air cooling machine and the dehumidifier are arranged in the housing,
• the housing has a sealed structure in which the internal space is substantially sealed,
• the cooling water pipe is branched so that the heat receiving part, the heat absorption part, and
• the high temperature part are connected in parallel, and the cooling water supply device supplies a common cooling water of the same temperature to the heat receiving part, the heat absorption part, and the high temperature part.