Patent ID: 7924406

Claim:
An illuminator for a lithographic apparatus, the illuminator comprising: a first and a second illuminator channel, each of the first and the second illuminator channel including elements which are adjustable to provide a radiation beam with at least one desired property; a first switch device configured to receive the radiation beam and arranged to direct the radiation beam between the first and second illuminator channels, said first switch device being configured, when arranged in the illuminator, to move independently from, and relative to, the first and second illuminator channels to direct the radiation beam between the first and second illuminator channels; an additional illuminator part and a second switch device, the second switch device arranged to receive the radiation beam from the first and second illuminator channels and direct the radiation beam through the additional illuminator part, the additional illuminator part including elements which apply at least one additional desired property to the radiation beam, wherein the first switch device comprises a moveable mirror that is rotatable between a first and a second position so as to direct the radiation beam between the first and second illuminator channels, and wherein the second switch device comprises a second moveable mirror that is rotatable between different positions so as to reflect the radiation beam outputted by the first or the second illuminator channel.