Thermal processing system with temperature non-uniformity control

A thermal processing system, comprising:

• a processing chamber;
• a workpiece disposed within the processing chamber;
• a heat source configured to emit light towards the workpiece, the heat source including an array of linear lamps, each of the linear lamps having a long dimension that extends along a first direction;
• and
• a tunable reflective array disposed between the workpiece and the heat source, the tunable reflective array comprising a plurality of pixels, each of the plurality of pixels having a linear shape and a long dimension that extends along a second direction that is perpendicular to the first direction, each pixel of the plurality of pixels comprising an electrochromatic material configurable in a translucent state or an opaque state,
• wherein when the electrochromatic material is configured in the opaque state, the pixel reduces transmission of the light through the pixel, and
• wherein when the electrochromatic material is configured in the translucent state, light at least partially passes through the pixel.