Patent ID: 10531551

Abstract:
The extreme ultraviolet light generating apparatus includes a target supply unit to output a target, a driver laser to output a driver laser beam with which the target is irradiated, a guide laser to output a guide laser beam, a beam combiner to have optical paths of the driver laser beam and the guide laser beam substantially coincide with each other and output these beams, a first optical element including a first actuator to adjust an optical path of the driver laser beam to be incident on the beam combiner, a second optical element including a second actuator to adjust an optical path of the guide laser beam to be incident on the beam combiner, a sensor to detect the guide laser beam outputted from the beam combiner to output detected data, and a controller to receive the detected data, control the second actuator based on the detected data, and control the first actuator based on an amount of controlling of the second actuator.