Patent ID: 8451423
Filing Date: 2013-05-28
Classification: G03F

Abstract:
1. A lithographic projection apparatus comprising: a projection system configured to project a patterned beam onto a substrate, the projection system having a final element; a liquid handling system configured to supply an immersion liquid to a space between the final element and the substrate, the liquid handling system comprising a barrier member at least partly surrounding the space, the barrier member including a plurality of extraction conduits that are arranged to extract a mixture of immersion liquid and gas, a surface of the liquid handling system facing a surface of the projection system across a gap formed therebetween; a plurality of independently controllable heating and/or cooling devices thermally coupled to the final element, the heating and/or cooling devices being spaced apart and at least one of the plurality of heating and/or cooling devices located in proximity to each of the extraction conduits and located in a surface of the gap; and a control system coupled to the plurality of heating and/or cooling devices and configured to control separately ones of the heating and/or cooling devices to maintain a desired spatial temperature profile in the final element.