Patent ID: 7880860

Claim:
A lithographic apparatus, comprising: a substrate table configured to hold a substrate; a projection system configured to project a patterned beam of radiation onto the substrate, the projection system comprising a final optical element adjacent the substrate; a liquid supply system having an immersion liquid outlet configured to provide an immersion liquid to a space between the projection system and the substrate table for projection of the patterned beam; and a cleaning device configured to clean the final optical element, the substrate table, or both, the cleaning device comprising: a liquid confinement structure of the liquid supply system, the liquid confinement structure configured to partially'confine immersion liquid in the space during a projection of the patterned beam onto the substrate and to partially confine a cleaning fluid in the space during a cleaning using the cleaning device; and a cleaning fluid outlet, different from the immersion liquid outlet, to supply cleaning fluid to the space for cleaning, wherein the immersion liquid flow through the immersion liquid outlet does not share a flow path with cleaning fluid flow through the cleaning fluid outlet immediately before supply of immersion liquid or cleaning fluid to the space.