Underwater laser processing device including chamber with partitioning wall

An underwater laser processing system comprising:

• a laser torch including a condenser lens;
• a laser torch driving mechanism for changing an emission position of said laser torch;
• and
• a laser torch containing chamber for containing said laser torch and said laser torch driving mechanism;
• wherein said chamber for containing said laser torch has, at a portion for emitting laser light, a water-tight partitioning plate movable for allowing said laser torch to come in or go out of said chamber for containing said laser torch;
• a processing chamber provided at a portion for emitting laser light and processing a structure to be processed in such a manner as to be in contact with said structure to be processed in order not to allow water to flow in said processing chamber;
• and
• said processing chamber is provided integrally with, or independently from, said chamber for containing said laser torch, and is provided with an inert gas injection mechanism, an inert gas exhausting mechanism, and a water discharging mechanism.