Methods and systems to keep a work piece surface free from liquid accumulation while performing liquid-jet guided laser based material processing

A liquid jet guided laser system comprising

• a laser for emitting a laser beam;
• a nozzle module,
• wherein the nozzle module is configured to be connected to a liquid supply line for forming a liquid jet;
• an optical element for coupling the laser beam into the liquid jet;
• an air jet module,
• wherein the air jet module is coupled to the nozzle module,
• wherein the air jet module comprises an inner wall and an outer wall,
• wherein the inner wall forms a first conduit for accepting the liquid jet to pass through,
• wherein the inner wall and outer wall form a second conduit completely surrounding the first conduit,
• wherein the outer wall comprises a gas inlet for connecting to a gas supply line for forming a gas flow through the second conduit,
• wherein the gas flow passing through the air jet module surrounds the liquid jet,
• wherein the air jet and the liquid jet are configured to be guided toward a workpiece,
• wherein the inner wall is configured so that the gas flow is diverged from the liquid jet.