Patent ID: 8390789

Claim:
A substrate support apparatus, comprising: a substrate chuck; a Z stage coupled to the substrate chuck; a stage mirror mounted to the Z stage; an XY stage coupled to the Z stage; and one or more relative position sensors configured to sense a displacement of the substrate chuck relative to the stage mirror in X, Y, and Z directions, wherein the one or more relative position sensors is coupled in one or more feedback loops with a means for dynamically compensating for motion of the substrate chuck relative to the stage mirror in the X, Y, and Z directions, wherein the means for dynamically compensating for motion of the substrate chuck relative to the stage mirror in the X, Y, and Z directions includes one or more actuators configured to impart movement to the XY stage or the Z stage, wherein the one or more relative position sensors include one or more relative position sensors co-located with the one or more actuators.