Device for improving contrast ratio of short pulse laser utilized in e.g. radiation therapy, has plasma mirror or target material arranged relative to radiation of pulses in laterally displaceable manner, due to formation in target chamber

摘要

The device has a plasma mirror at which plasma for reflection of a main pulse of laser radiation is produced by incidence of a laser pulse i.e. prepulse. An intermediate chamber (4), vacuum chambers (1, 7, 8, 14) and target chambers (10) are optically connected together and are pneumatically separated by respective structures, a target manipulator (12) and vacuum units (22, 23). A plasma mirror (18) or a target material (11) is arranged relative to radiation of incident, focused laser pulses in a focal plane in a laterally displaceable manner, due to formation in one of the target chambers.